Bore (in): 4.030 in. Bore (mm): 102.362mm Piston Style: Dome, with two valve reliefs Piston Material: Forged aluminum Compression Distance (in): 1.608 in. Dome Height (in): 0.150 in. Piston Head Volume (cc): -6.80cc Wrist Pin Style: Press-fit or floating Wrist Pin Included: Yes Pin Diameter (in): 0.912 in. Piston Ring Thickness: 1/16 in. x 1/16 in. x 3/16 in. Piston Rings Included: No Quantity: Sold as a set of 8. Notes: Solid dome design. ICON premium forged pistons are made from high-strength, T-6, heat-treated, 2618 primary aluminum alloy. They feature a diamond-machined skirt, head, mini-grooves, pin bore, gas accumulator, ring grooves, and pressure-drilled pin hole oiling. They have a V-rib design for lightweight, strength, and maximum piston cooling. Compare weight, performance, design, and cost, and you will win with ICON!