KB Pistons are a performance line of pistons manufactured for the aftermarket automotive industry by UEM (United Engine & Machine).

UEM are the manufacturers of a select group of Piston brands including KB Performance, Silv-O-light Pistons and Icon Racing Pistons.

Their line of KB Pistons are their performance range of hypereutectic pistons targeted at aftermarket performance applications.

They are designed for a wide range of engine applications in different piston styles and to suit differing rod lengths.