Review on Black and Pink Adhesive Stretchy Fabric Lycra Card Holder for Phone - Dual Slots Stick On Wallet Pocket for iPhone and Smartphones by Trey Michaels

The card holder is made from stretchy nylon material, making it easy to attach more than one card and also maintains its size when you are only attaching one card. I made sure the back of my case was clean (I cleaned it with an alcohol swab) before attaching the mount to my phone case and it holds up very well. Very happy with my purchase. The small pocket is great for storing receipts or for stacking currency if you're traveling light!