These are amazing, they stick to the back of your phone or inside your boots to hold your cards. Normally holds 2-4 cards depending on how far they are stretched. These do not get so loose that they can't hold cards like some card holders do. These stick on using heavy duty 3m stickers. These are handmade, there will be some slight variation from wallet to wallet. These are made to order, please allow 2-3 weeks before shipping.