Made of silicone, with adhesive sticker on the back to stick it on the smooth back of your phone Easy to use: peel off the sticker cover and stick it to the back of your phone, and finish by pressing gently Suitable to hold up to to 4 cards, such as: ID card, credit cards, driving license, business cards, membership card, insurance card, discount card, loyalty card, etc. Silicone card holder for the back of the phone, also can be used to store money, charging cable, earphones. , USB stick, cigarette lighter, etc.”