Yamaha 4 valve YBB, YCB, YEB, & YFB Tuba. OEM Valve Springs (approximately 3/4 x 2 inches).
Fits:
YBB-321
YBB-321(2)
YBB-321S
YBB-321S(2)
YBB-621
YBB-621S
YBB-631
YBB-631S
YCB-621
YCB-621S
YCB-822
YCB-822S
YEB-321
YEB-321S
YEB-381
YEB-381S
YEB-632
YEB-632S
YFB-621
YFB-621S
YFB-822
YFB-822S