Durability: N20 gear motors utilize miniature metal gears with excellent stall characteristics, heat and vibration resistance, making them suitable for demanding applications. WIDE APPLICATIONS: These DC motors are compact and small in size, making them suitable for DIY remote control toys, vehicles, drones, and airplanes. They are ideal replacements for damaged or worn gear motors in various devices. Motor operating voltage: DC 3V–6V Can start unloaded with 1 x 1.5V AAA battery (batteries not included) Motor size: 10x12x15mm (N20 motor) Diameter: 10x12mm Output shaft diameter: 3mm (flat position, D-type shaft) Output shaft length: 10mm Weight: 9.5g Voltage: 2.5V, RPM: 20 Voltage: 3.6V, RPM: 40 Voltage: 5V, RPM: 60 Color: Material: Metal Package Contents: 8 x Geared motors Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement allowance: +/- 1–3cm.