Be sure to add me to your favorites list Casio Replacement Part: 10 Black Key Strip Set for Some of the Casio Mid-Size "MT" Models, and Possibly Other Model Keyboards. Let me begin by saying these are NOT full sized keys, they are the half-sized keys that come in groups, and are used on some of the "MT" model Casio keyboards. This is a very good condition set of Casio replacement parts, a set of black replacement keys, which have 10 keys on a strip, for use with some "MT" model Casio keyboards, and possibly other Casio models as well (please look at them closely and see if they match what you need). These key sets are the type that come in a group, if you need the type that are individual type keys, I have many of them listed as well. This part is all 1 piece, and they they can be used to replace an entire section of keys that you have that are broken, just by taking those out and screwing these back in. You can also trim this part to make it fit if you didn't see the entire 10 keys. If you have some broken or missing keys, these will work for you to complete your keyboard if you have a compatible Casio model. I do not have a list of the exact Casio models that these will work for, but they're from an MT model Casio that has the "group" type keys, NOT the single type keys (again, I do have some of those available in other listings). As I wrote before, these are used but in very good condition, and will come in handy if you have some broken or missing black keys for a compatible Casio keyboard. Please look closely to see if what you've removed from your Casio matches what these look like. You should be able to tell even if there is a key missing from your broken pieces. Please write to me and attach photos if you're not sure, and I will try to help. Thanks for looking! Check out my Store!