We R Memory Keepers Button Press Refill Pack 25 pack - Medium (37mm). Easily create buttons, magnets, keychains and so much more with the Button Press by We R Memory Keepers! Button Press (WR660524) sold separately. Create custom medium sized buttons for backpacks, bags and more with these button refill packs. This package includes 25 medium button pin backs (1.45 inches/37mm).