This is a  overhaul kit featuring 2 new  pistons, pins, circlips and rings , Full gasket/seal  kit per picture.. STD 76mm  bore 582.

This  aftermarket set exceeds the MFGs specs and features the following.

Less start up friction due to moly coated skirts, lower heat build up w/ hard crown anodized domes, stronger pin boss, less skirt friction and better heat transfer for near zero scuffing and seizing, smoother running and most important, more power Our A&Ps have used these in our engine shop for 7 years now with no problems

 This set is for std bore 582 rotax.