This is a complete top end rebuild kit for 2018-23 KTM 85 SX Includes: - Wossner German Forged KTM SX-85 Piston with, ring or rings, wrist pin, wrist pin bearing and circlips * 46.95mm piston for 47.00mm bore, clearance .05mm - Complete Vertex top end gasket set - Wrist Pin Bearing B1012 https://mcbperformance.com/i-23431176-mcb-stage-1-ktm-85-sx-top-end-piston-kit-2018-2023-replaces-47230007100.html