Bach Stradivarius OEM Trumpet Valve Spring, D10mm x L42mm, set of 3 springs. Fits all 180 Trumpets & the C190SL229. Confirmed fit for a 1934 King H.N. White and a 1958 28A Conn Connstellation Cornets. See my item # 273154426055 for a Stradivarius valve repair kit.