https://www.revrobotics.com/rev-45-1655/

REV Mecanum Wheels are steel plates with rollers supported by ball bearings allowing for the perfect combination of wheel rigidity and roller movement. Included in the set of wheels are Universal Hex Adapter making mounting to 5mm hex shaft easy. With a 75mm diameter these wheels allow for a lower profile giving more space for building mechanisms and space for game elements.

Specifications:

• Hub Material: Steel

• Roller Material: NBR

• Diameter: 75mm

• Width: 40mm

• Weight (single wheel without Universal Hex Adapter): 179 g (0.395 lbs)