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This listing is for (8) Speed Pro LW-2256F 40 TRW Forged Aluminum Light weight pistons in 4.040" Bore over size. These pistons are made from extruded VMS-75 aluminum alloy that's forged under 3,000 tons of pressure to "near-net" shape. After that, they're machined to their final configuration. These pistons offer excellent strength and durability and are capable of taking the punishment that's dished out on the street and in competition. Flat Top Valve relief pistons. USES 1/16 in. x 1/16 in. x 3/16 in. ring package.Approximately 40 Grams lighter than L-2256F version.