Made our first rammer since 1983, with mature technology and better materials, our rammer will last a long, long time. We have other models of gasoline rammers, as well electric rammers. Please check out our webpage for more information. Aluminum Alloy Anti-Shocking EngineBetter Thermal DiffusivityAluminum Alloy Crank Shaft Hose, for Lighter WeightAlloy Steel Gears, for Longer DurabilityForged 40-Chromium Alloy Piston, Extreme High StrengthForged Alloy Steel Plate, Anti-DeformingAlloy Spring, for higher elasticity ModelHCR80EngineRobin EH12-2DEngine Power4 HPImpact Force17 KNPercussion Rate600-700 times/minTravel Speed12-17 m/minJumping Height45-65 mmPlate Size340*285Weight80 kg