Model: SG90 Technical data given by the manufacturers: Size: 21.5mmX11.8mmX22.7mm Weight: 9 grams No-load speed: 0.12 seconds / 60 degrees (4.8V) Stall torque of 1.2 - 1.4 kg / cm (4.8V) Operating temperature: -30 to +60 degrees Celsius Dead-set: 7 microseconds Operating voltage: 4.8V-6V All original accessories include: steering gear, rocker arm, screws, etc.