Frequently Asked Questions

Answers to common questions about DEFF's premium device protection — Arclin™ Kevlar® cases, OHARA NANOCERAM™, AGC Dragontrail® Pro and tempered-glass screen protectors, and accessories for iPhone, Samsung Galaxy, Sony Xperia, Google Pixel and more.

What is Arclin™ Kevlar® and why use it for a phone case?

Kevlar® is an aramid fiber, originally invented at DuPont and now produced by Arclin™, that is roughly five times stronger than steel by weight. DEFF's DURO® cases use genuine 1500D Arclin™ Kevlar® fiber to create an ultra-thin case (from 0.65mm) that is also ultra-light (from about 11g), exceptionally strong, and has zero effect on cellular signal, NFC, or wireless charging.

Do DEFF Kevlar cases support MagSafe and wireless charging?

Yes. Every DURO® case supports wireless charging. The DURO® Special Edition and DURO® Ring Master models also add MagSafe magnetic support. Kevlar® does not block wireless charging, NFC, or cellular reception.

Are DEFF cases drop-tested and rugged?

The DURO® Special Edition and Ring Master cases are certified to U.S. Military Standard MIL-STD-810H for drop protection, with reinforced raised edges that guard the camera and screen. The standard DURO® case keeps a slim profile while still protecting against everyday drops and scratches.

What is AGC Dragontrail® Pro glass?

Dragontrail® is a chemically strengthened glass made by Japan's AGC. DEFF's ULTRA HARD GLASS protectors use Dragontrail® Pro for high scratch and impact resistance, finished with a multi-layer oleophobic (anti-smudge) coating and an included alignment tool for easy, bubble-free installation.

What's the difference between ULTRA HARD GLASS, SUPER TOUGH GLASS and NANOCERAM™?

ULTRA HARD GLASS uses premium AGC Dragontrail® Pro glass and comes in clear, nano-matte, anti-UV/blue-light and privacy options. SUPER TOUGH GLASS is triple-strengthened tempered glass rated 9H, as slim as 0.25mm, with in-display fingerprint-sensor support. NANOCERAM™ Premium Glass is DEFF's most impact-resistant protector, made from OHARA's nano glass-ceramic to flex and resist breakage.

Should I choose a clear or matte (nano-matte) screen protector?

Choose clear for the brightest, truest colors — ideal for photos and video. Choose matte (nano-matte) to cut glare and fingerprints with a smoother, paper-like feel that many people prefer for gaming and outdoor use.

Will a DEFF screen protector work with in-display fingerprint sensors?

Yes. DEFF protectors for Samsung Galaxy, Google Pixel and other phones with under-display fingerprint readers are engineered to maintain fingerprint recognition through the glass.

Does DEFF make cases for AirPods, Apple Watch and iPad?

Yes. DEFF offers DURO® Kevlar® cases for AirPods 3, AirPods 4 / 4 ANC and AirPods Pro 3; Apple Watch Series 4 through 11 and Apple Watch Ultra; and iPad mini 6 / 7, along with matching screen protection and accessories.

How do I install a DEFF screen protector?

Each ULTRA HARD GLASS protector includes an alignment and installation tool for an easy, bubble-free application. Clean the screen thoroughly, use the guide to position the glass precisely, then let it self-adhere from the center outward.

Which devices does DEFF support?

DEFF makes accessories for Apple (iPhone 15, 16 and 17 series, iPad, AirPods and Apple Watch), Samsung Galaxy (S24, S25 and S26 series), Sony Xperia (1 and 10 series), Google Pixel (9 and 10) and the Nintendo Switch 2.

What does DEFF mean and where is the brand from?

DEFF is a Japanese accessory brand whose name reflects its philosophy, “Design Evolution For the Future.” The brand specializes in premium materials such as Arclin™ Kevlar®, OHARA NANOCERAM™, AGC Dragontrail® glass and Toray® carbon fiber.

Car Accessories

What car (motoring) accessories does DEFF make?

DEFF's motoring line includes WIZ® Arclin™ Kevlar® smart key fob covers for Mercedes-Benz, BMW, Audi and Nissan; CNC-machined aluminum fuel cap covers; tempered-glass infotainment screen protectors for BMW, Nissan, Peugeot and Citroën; the Airput® wireless-charging vacuum car mount; and the Toraysee® Z microfiber interior cleaning cloth.

Is DEFF affiliated with Nissan, BMW or other car manufacturers?

No. DEFF is an independent Japanese accessory manufacturer. Some DEFF display protection films are also sold through Nissan's own accessory catalog in Japan (Car Life Collection). Car brand and model names in our product titles describe vehicle compatibility only and do not imply endorsement or certification by the car manufacturer.

Will a DEFF car accessory fit my exact vehicle?

Fitment depends on the model, the generation and — for screen protectors — the display size. Check the model and generation code in the product title (for example LEAF ZE2 or Serena C28) against your vehicle before ordering. Fuel cap covers have some exceptions: the standard Nissan fuel cap cover does not fit the Kicks, Note (E13) or Skyline (R32).

What is the difference between the AG and AR coatings on DEFF car screen film?

AG (anti-glare) scatters incoming light to soften harsh reflections, while AR (anti-reflective) reduces the amount of light reflected from the surface, cutting flicker and ghosting. DEFF's car display film combines both.

How do I clean a car display protector without scratching it?

Use a soft microfiber cloth such as Toray's Toraysee® without detergent. Toraysee® cloths are machine-washable and reusable.

Are DEFF car accessories made in Japan?

DEFF's car display protection films are manufactured in Japan. The country of origin for other accessories is listed on each product page.

Orders, Payment, Shipping & Returns

Can I change or cancel my order after placing it?

Orders cannot be modified once placed — including the shipping address, contact details, quantity or color. If your order has not shipped yet, cancel it from your account page for a full refund and place a new order with the correct details, or contact us for help.

Why was my order automatically cancelled?

Orders may be cancelled automatically because of payment issues, items being out of stock or failed verification checks. Contact us for details.

What if I placed a duplicate order by mistake?

Contact customer service right away so we can cancel the duplicate. Please note that separate orders cannot be combined into one shipment after they are placed.

What payment methods do you accept?

We accept major credit cards, PayPal and other local payment methods shown at checkout.

Why was my payment declined?

Payments can be declined because of insufficient funds, incorrect payment details or bank authorization checks. Please check with your bank or try another payment method.

Does DEFF ship internationally?

Yes. deff.international ships worldwide. Available shipping methods, costs and estimated delivery times for your country are shown at checkout. Customers in Taiwan can also choose convenience-store (CVS) pickup.

How can I track my order?

Once your order ships you'll receive a confirmation email with a tracking number. You can follow your parcel any time on our order tracking page, or check the order status by logging in to your account at account.deff.international.

What is DEFF's return policy?

You can return any unused item in its original packaging within 14 days of delivery, for any reason, in every country. Return shipping is paid by the customer, except for defective, damaged or wrong items, where we cover it. Custom or engraved items are excluded. Start a return from your account at account.deff.international, and see our Returns Policy for full details.

Can I return part of my order, and how long does a refund take?

Yes, you can return individual items from an order. Once we receive and inspect your return, approved refunds are issued to your original payment method within 14 days. Your bank or card issuer may need some extra time to post the refund.

Do DEFF products come with a warranty?

DEFF products do not carry a separate manufacturer warranty. Defects are handled on a DOA (dead on arrival) basis: if an item arrives defective, damaged or incorrect, contact us within 14 days of delivery and we will refund or replace it and cover the return shipping. Your statutory rights under local consumer law are not affected.