This product is perfect for gamers who have cracked or damaged Game Boy cartridge casings. It's a great solution to bring new life to your old cartridges. The replacement shell casings are easy to use. Each pack contains 3 cartridge shells and 3 replacement Philips securing screws. It's designed to fit Game Boy cartridge game circuits, allowing you to transfer your game to the new plastic shell quickly. Compatible only with Gameboy game cartridges. Tools like a Tri-wing screwdriver (not included) for original cartridges and a small Philips cross head screwdriver (not included) for replacement screws are needed. You also have the option to reuse the original screw.