Caber brand F-cast piston rings setHighest quality made in Italy. Exceeds OEM specifications.Fits: Stihl 029, 032, Husqvarna 51, 254, 350, 353, Wacker WM80(Later 029"s (before serial # X 39 305 257) have a 46mm piston & earlier 350"s have a 44mm piston. Please verify before ordering.)Replaces OEM"s: 1113 034 3006, 503 28 90-11, 4590445mm x 1.5mm