Durability: N20 gear motors utilize miniature metal gears with excellent stall characteristics, heat and vibration resistance, making them ideal for challenging applications. WIDE APPLICATIONS: These DC motors are small in size, making them ideal for DIY remote control toys, vehicles, drones, and airplanes. They are great replacements for damaged or rusty gear motors in a variety of machines. Motor applicable voltage: DC 3V-6V When unloaded, it can be started by 1 x 1.5V AAA battery (batteries not included) Motor size: 10 x 12 x 15 mm Output shaft diameter: 3 mm (with flat position, D-type shaft) Output shaft length: 10 mm Weight: 9.5 g Voltage: 2.5V, RPM: 20 Voltage: 3.6V, RPM: 40 Voltage: 5V, RPM: 60 Color: As shown Material: Metal Package Contents: 8 x Geared motors Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.