Features: Brass Head Forged Bronze Connecting Rods with Lifetime Warranty Hardened Stainless Steel Piston Guides High Efficiency Stainless Steel Check Valves Abrasion Proof, Heat Resistant, Industrial Ceramic Plungers High Quality Buna- Textile Double-Sealing V-Packings Die-Cast, Anodized Aluminum Crankshaft-Fin Design for Optimal operating Temperature High Quality Oversized Ball Bearings Optimal Oil Bath for High Speed Operation S 24mm Solid Shaft for Belt Drive, Gearbox or Flex Couplers