Yamaha OEM Tuba & Sousaphone YBB & YSH after 1987, valve tune-up kit.  3 each guides, springs, valve stem felts & pads, top cap felts & pads, valve guide washers & 2 each water key corks.  See my item ID# 274295072744 for a 4 valve kit.  If in doubt, email me with your model.