Sealed Power Hypereutectic Piston - 3.907 in Bore - 1.50 x 1.50 x 3.00 mm Ring Grooves - Coated Skirt - GM LS-Series (Set of 8) R01J003S Features Twin 4 2 1 2 to M77MS829H30 1303LS1-3 Size:Youth 2X-Large

Features Twin 4

including Motorola and Rugged digital

Music input jack

Ultra-smooth mandrel bends ensure maximum flow and power

Bump Springs are used in conjunction with a primary spring to allow a race car to have a relatively soft / compliant initial spring rate to get down to the desired optimum ride height and then pick up the rate of the bump spring to achieve a constant / optimum dynamic ride height

Sealed Power Hypereutectic Piston 3.907 in Bore 1.50 x 1.50 x 3.00 mm Ring Grooves Coated Skirt GM LS Series (Set of 8) R01J003S Features Twin 4 2 1 2 to M77MS829H30 1303LS1 3 Size:Youth 2X Large Features Twin 4 including Motorola and Rugged digital