DescriptionMachined from Wiseco sleeve forgings to offer the same toughness as Wiseco's forged pistons.Hard anodized and Teflon coated for low friction and prolonged wear resistance. Sleeves have a smooth radius that tapers down to the specific bore size. Compresses the piston rings smoothly and evenly. Greatly reduces the difficulty with installing thin high-performance oil rings. Available in bore sizes ranging from 65.5-104.00mm and 2.780-4.155 inches