VERTEX Piston Kit - 63.95 - Banshee YFZ350mm 23607Piston Kit 63. 95 Banshee YFZ350mm The piston is heat treated with a T 5 hardening and tempering cycle, The piston skirt is coated with a high tech Molybdenum Disulphite coating for faster break in time and increased piston life, Cast piston is gravity cast aluminum alloy (not forged) with 18% silicone content, Piston kit includes piston, rings, wrist pin and circlips, For use with Hot Rods Stroker crankshaft.