USA Edition Penny Popsocket Vintage Coin Collectors Dream Come True. Funny Collector popsocket. Perfect For Dads Fathers. Crazy for Coins? Best popsocket for anyone that loves dollar graphic designs that are vintage. Perfect for any american coin collector that loves collecting coins. Perfect Gifts For Numismatics Adhesive backing attaches the PopGrip to your case or device. Will not stick to silicone, leather, waterproof, or highly textured cases. Works best with smooth, hard, plastic cases. Not compatible with wireless charging Printed top is swappable with other compatible PopGrip models. Just press flat, turn 90 degrees until you hear a click and remove to swap.