Sumozade Black Spare Bond Silicone Wheel The Greatest Silicone Wheels Ever Are Here. It's more than just a wheel. Only new silicone wheels are shipped. The Bond Silicone Wheels are useful for line-follower robots, mini sumo robots, and all other robot projects. They are designed and manufactured in our lab. The wheel's high grip and high traction on Dohyo are its noteworthy features. Reaching the highest traction is made possible by the Shore A10 wheel tread. These are the world's softest silicone wheels. There are various color types. Simply pick your favorite hue. Bond Wheels made of silicone Details Wheel Shore: 10A Wheel Diameter: 65mm Wheel Width: 23mm Ten grams in weight