Features: The motor uses 24v input power. Do not use other power sources to avoid damage. Nonadjustable speed, high speed bearings, high revs, low noise. Use simple and reliable components and circuits to drive the ro-tor. The ro-tor structure is simple and stable. In order to extend the service life of the motor, please do not energize for a long for time, so as to avoid the coil heating and affect the experience. A great toy for education purpose & cultivation of scientific interest. Specifications: Material: Magnet+Acrylic +Copper Size: 17X15X13cm/ 6.69x5.91x5.12 in Power supply: 24 v Speed: 500-1500 RPM Power consumption: 5-15 for w Magnet: 8pcs, 20x10MM Package Includes: 1x Bedini Motor note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.