This set is specially design for Go-kart or kids car or huge scale speed reduction. This set increase the torque of motor a lot. this reduce the speed via 3 times and increase the torque via 3 times.
This set includes 1 pcs big pulley and 1 pcs small pulley. Small pulley suitable for 775 motor like 5 mm shaft motor.  you can use this system to increase the torque of the motor. You can also able to connect two motor using this. Belt full length is 1 foot. we connet the ends of the belt.  so it will help you to use.  Pulley have 2 key thigh facility for good attachment.
Package Include- 
1 x Big pulley
1 x small pulley
1 x belt
1 x L key