Specifications: Torque: 45.6Kg-cm Speed: 0.12sec/60deg(@7.4V) Torque: 37.3Kg-cm Speed: 0.15sec/60deg(@6.0V) Features: Dimensions: 40.4?37.5?20mm (Standard size) Weight: 77.0g Operating voltage: 6.0~7.4V (Lipo, Life, Ni-MH) Brush-less motor Reinforced stainless steel final gear Hard anodized aluminum gear Dual ball bearings Hard servo gear shaft Aluminum top case Aluminum heat sink middle case Black cable Gold plated connector Serial Compatible HCS Compatible