... Alloy Spring, High Elasticity Forged 40-chromium Alloy Piston Made our first rammer since 1983, with mature technology and better materials ... , our rammer will last a long, long time. We have ... Lighter WeightAlloy Steel Gears, for Longer DurabilityForged 40-Chromium Alloy Piston, Extreme High StrengthAlloy Spring, for higher elasticityForged Alloy Steel ...