This is micro 130 motor with red rear cover, which is a Strong Magnetic motor with high torque and high speed.Can use 3V 4.5V 6V 9V 12V power to drive. Technical Parameters: Rated Voltage: 3V-12V DC Rated Speed:9000 -25000 RPM (3V-12V) Color:Siler+Red; Motor Body Diameter:27mm/1.06"; Shaft Size:10x2.0mm/0.39"x0.08"(L*D); Motor Body Length;38mm/1.46" Output Shaft: 2.0mm Length of Output Shaft: 7.5mm Height of Motor: 25mm Motor Dimension: 15 * 20mm Package Included: 10 X DC Motor 130 10 X Motor Mounting Bracket Holder