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KB Hypereutectic Piston 4.155" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 22.0 cc 13106 Polyurethane is a synthetic polymerProduct Description: Piston KB Series Hypereutectic 4. 155 in Bore 5 64 x 5 64 x 3 16 in Ring Grooves Minus 22. 00 cc Small Block Chevy Set of 8 Created from a high silicon aluminum alloy, KB Performance pistons are lightweight to improve throttle response and RPM changes while still being strong enough to withstand high compression and high temperatures. Each piston is engineered with race ready features like high upper compression ring locations,