LA Sleeve Cylinder Sleeve FL5684 Re-sleeve worn or seized cylinders with sleeves manufactured by LA Sleeve Co. An economical solution available for riders, racers and engine builders everywhere. Centrifugal castings used in these sleeves are made from a carbon-chrome-molybdenum alloy of 200 Brinell hardness, ensuring ease of installation, trouble-free boring and a dependable, long-lasting engine Original cylinder bore is chrome plated, nikasil, or electrofused