PISTONS are madeof aluminum alloy through casting process. The ability of the cast material is having high strength, strength for high hot resistance for surface abrasion, better thermal conductivity and low thermal expansion.The high conductivity of this material promotes cool running and the light but robust design ensures efficient operation over extended periods. Resistance to wear ring grooves, skirt, and gudgeon pin hole is greatly increased.The pistons consist of bare compressor ring groove or insert of spheroidal-graphite (SG) alphin for long lasting.