10pcs 1.5V-3VDC 100mA-200mA 4x14MM Micro DC Coreless Motor Mini Vibration Motor With Rubber sleeve Voltage:1.5V-3VDC; Current:0.1-0.2A Total length: 19.7 MM (including eccentric) Weight: 1.6 g, Packing:10pcs Great for a science experiment Perfect for building "brushbots" for our STEM class.