SideKick Mini for Cards hooks onto the sidewall of any typical card storage box, gripping the cardboard snugly to stay put. This gives your valued cards the RIGHT fit in any box or row, holding them upright and damage-free. No more wads of bubble wrap. No more sponge blocks. Or cardboard, empty plastic cases, or whatever else you've been using. You'll never again hear that awful sound of your valued collectibles flopping over and getting bent in storage. Compatible with nearly any cardboard card box (i.e., 3000-count boxes, 5000-count boxes, single-row shoe boxes, drawer boxes, etc.) Made of high-quality ABS plastic, durable and sturdy - Easily repositioned as you add or remove cards from a box - Designed by a lifelong collector, and Made in the USA