Be sure to add me to your favorites list Yamaha Replacement Key For DX-100 CS-01 Genuine Yamaha Replacement Mini Key Part. This is for one (1) half-sized mini key, a genuine part from Yamaha. These smaller type keys are for the DX100 mini FM synthesizer and the CS01 mini analog synthesizer that used this type of mid-sized mini keys. They should also work for the CS01 II which is very similar to the CS-01, and maybe for the CBX-K1 mini keyboard controller but I'm not 100% sure about that one, so please look at the photos and compare. I have a few of each note available, and you can get one or more if you needed them. Just add the ones that you needed into your shopping cart. Again, these are NOT full sized keys, but the smaller sized keys that are half the size of full sized keys that are used in the models listed. The width of one of these keys at it's widest point is 3/4" of an inch wide. These are in very good condition, and I have several of them available. Price is for one key, and you can get one or more of any of the notes that are available. If the note that you need is unavailable, just message me and I'll double check to see if I have more, which is entirely possible as I have a lot of keyboard parts around here. This is a replacement key part and price is for one (1) key. This is not an entire instrument. If you have any questions, I'm always happy to answer them. Thank you so much for looking! Thank you for looking! Check out my Store!