Be sure to add me to your favorites list Casio Keyboard Replacement Mid-Sized Black Key (Sharp / Flat) for Many MT Models, the CZ 101, and Other Casios This is a half-sized Casio Black (sharp / flat) key from an 1980's vintage Casio keyboard. These were used on many of the "MT" models, the CZ-101 synthesizer, and other Casio models with mid-sized / half-sized keys. These are NOT full sized keys, but the smaller sized keys that are half the size of full sized keys (they've also made micro sized keys too, and these are larger than those). I have many of them and they will replace broken black keys on many Casio models. Check your keyboard first to see if it takes this type, you may even have to open your Casio up to make sure, and you can ask and I might be able to help with that as well. There are some MT models that take keys that come in a group, not this individual type, and there are a very few MT models that have slightly smaller keys than this. This one is in very good condition, and I have several of them available. You can get one or more of these to replace broken keys on your Casio keyboard. Thanks for looking, Check out my Store!