This is one of the favourites DFRobot customized high quality DC motor.
It is a low noise motor and high torque output motor with optical encoder built-in.

Technical Details

Size (LWH): 5.5 inches, 1.9 inches, 1.8 inches
Product Details
Product Dimensions: 5.5 x 1.9 x 1.8 inches
Shipping Weight: 0.6 pounds (View shipping rates and policies)
ASIN : B014L1TCRK