micro gear motor: SGM16-030PA 1.Diameter: 16mm 2.Can match encoder 3.Reduction Ratio:1/3,1/10,1/35,1/63,1/86,1/115,1/150,1/250,1/360,1/1000 4.Voltage: 1-24V 5.Motor speed: 500~15000rpm 6.Output speed: 5-500 rpm 7.Torque: 0.2-2.0Kg.cm 8.We can offer samples to test first. More property can be customized.