For Mazda 3 5 6 CX-7 MX-5 Miata w/ chip#4D63 * key blade size:47MM*10MM * Perfect replacement for the original motors and make you key like new * This is just a Key Cover shell, there is NO interior (remote/electronics/transponder chips) inside. * If you don"t sure whether this item is fit for your vehicle or not, you can tell us the Year, Make, Madel of your vehicle, the size of your key, and send us pictures of your original key