These phone card holders are made of quality silicone, lightweight, anti slip. Smooth on the outside with a corrugated looking texture on the inside, which can prevent your cards from falling out. The adhesive won't leave residue on phones, and it is very convenient and portable, you can stick this phone silicone wallet on back of cellphone, put the card you need into it to replace your bulky wallet. 3 25/64" L x 2 13/64" W