2pcs DC3.7-4.2V 716 7*16MM Micro DIY Helicopter Coreless DC Motor With Propeller Great Torque High Speed Motor

From the shop's description

This is a rare motor, and the small motor torque is very large, which is the value of it! Pack Including: 2* motors + 2 *propeller(1*Black propeller+1*Red propeller) Voltage: DC 3.7-4.2V Current: 0.08A–0.1A Speed: DC3.7V——34000 RPM Motor diameter: 7MM Motor length: 16MM Output shaft diameter: 0.8MM Output shaft length: 8MM Motor Weight: about 3.5g Propeller Weight: about 1g Propeller length: 45MM Propeller: Red or Black Line length: 80mm Note: when you install the propeller, press and hold the back of the motor to prevent damage to the motor. In order to prevent unnecessary loss, please buy more one for Spare, to prevent the sudden situation!