Probe Forged 7m Piston Set .5mm/.020" Oversize. PINS AND RINGS INCLUDED! Piston specs:*~300 grams*1.2/1.5/3.0 ring pack*.150 walled wrist pins*2618 Alloy*-20cc dish*.0035-.004 piston clearance. *Skirt thickness - 0.143*Skirt length - 2.232 from the top of the piston crown *Thickness under the crown - .230 thick. These pistons are a great deal at this price!