Yamaha tuba, marching Tuba & Sousaphone (& many many others). Not for marching euphoniums (they are smaller). OEM Valve Guide Set of 3 or 4 - G0141093 guides. Contact me if you wish to verify your model's fit or need parts for another horn. Fits: YBB-100S YBB-103(2) YBB-103S(2) YBB-104 YBB-104S YBB-105 YBB-105M YBB-105MS YBB-105S YBB-110S YBB-201(2) YBB-201M YBB-201MS YBB-201S(2) YBB-202M YBB-202MS YBB-321(2) YBB-321S(2) YBB-621 YBB-621S YBB-631 YBB-631S YBB-632 YBB-632S YCB-621 YCB-621S YCB-822 YCB-822S YEB-201YEP YEB-201M YEB-201MS YEB-201S YEB-321 YEB-321S YEB-381 YEB-381S YEB-631S
