Made of 100% silicone, non-toxic, odorless. Grey tone or natural color - easy to match with any surface color. | Sleeve or silicone wallet is dust proof, easy to clean. 3M sticker. Peel it off and stick it to the back of your phone or any other surface where you need an extra storage. | No need to carry your purse when you have a wallet at the back of your device and it is perfect for gift option! | The sleeve could fit up to 4 cards and these include business cards, credit/debit cards, IDs, etc. or any other items such as earphones or money.