A 25mm diameter dc motor, together with a motor bracket, a shaft connector and a multipurpose wheel. Specification Rated Voltage: 6V (Voltage Range: 4V-12V) Rated Speed: 135 rpm Rated Current: 0.65 A Rated Torque: 1.5 kg.cm Parts List 1x DC Motor-25 1x DC Motor-25 Bracket 1x Shaft Connector-4 1x Timing Pulley 90T 4x Screw M4x14 8x Countersunk Screw M3x8 2x Headless Screw M3x5 Visit Makeblock overview website to get more information about Makeblock and see what other application and extension kits are already available. Support If you have any further question for technical support, please contact waker@makeblock.cc or visit forum of Makeblock.