This Cylinder Kit contains Pistons made of hypereutectic aluminum alloy, which makes the piston inherently stronger. It is also more resistant to expansion and contraction, as well as scuff and corrosion resistant. Efficiency improves due to a better seal between the rings and cylinder wall.Includes: (1) HCTAR100616HC Piston (1) HCTAR63060 Cylinder Liner (1) HCTRE48380 Piston & Rings (1) HCTAR98850 Cylinder Liner O-Rings The HCTAR100646HC High Compression Cylinder Kit fits equipment brands such as: John Deere