Sav&ouml;x SW0241MG Waterproof 5th Scale Digital Servo .17/555 High Voltage Combines leading edge technology with super high 12 bit (4096) resolution The aluminum case design not only looks good but also allows for cooler and smoother operating temps Strong metal gear train for added durability Our servos are totally green - from materials to production, these servos are environmentally friendly Specs: 65.8x30.0x59.1; 200g, 6.0V: .21sec/416.6 oz-in, 7.4V: .17sec,555.5oz-in, Metal Gear, Dual BB, Spline 15-Tooth