All Yamaha OEM parts.  Euphonium YEP-642 & YEP-842 Valve Repair Kit.  4 each guides, springs, valve stem pads (2 layer felts), button pads (3 layer felts), stem washers (metal), and three cork washers (for valves 1, 2, & 3).  Also contains 2 each water key corks (1st & 3rd valve slide, 1 thicker for tuning slide).  If in doubt, email me with your model.  See my item ID# 273765437842 for a Euphonium 3 valve kit or 274302753171 for a YEP-321 & YEP-621 4 valve kit.  Contact me for other Yamaha kits.