This water resistant servo features One ball bearing on the output shaft. One internal metal gear (NOT THE OUTPUT GEAR, it is nylon). This works well in boats that require a lower than normal servo, for example a catamaran. SPECS: Dimensions: 44x23x25mm (1.7x0.9x1.0") Weight: 35 grams (1.23ozs) Speed: .18sec/60 degrees @4.8V Speed .14sec/60 degrees @6.0V Torque: 61.1 oz-in @4.8V, 76.3 oz-in @6.0V