Compatibility Unknown Stored for a long time. There are some scratches on the whole, including the shell. I bought it because I was fascinated by the EM model and heard that it would change to fit the shape of my fingers if I used a shell, but I didn't use it much. Why not start with pearl-shining buttons in 2026? The screw diameter is 3.9-4.0, and looking at the black spots on the back, it seems like clear lacquer is applied to the buttons... The material seems to be brass... (I completely believe I bought genuine YAMAHA parts, but it was over 10 years ago and I don't have the original packaging, so I can't confirm the material or finish.) The shaft is unpainted and dull, but it can be restored to a good condition to some extent by polishing. The shaft was not used because the screw threads did not match. *The listing may be cancelled suddenly. Please consider this, understanding the above.