https://www.gobilda.com/48mm-omni-wheel-8mm-rex-bore-50a-durometer/

This 48mm Diameter Omni Wheel is designed for use in the goBILDA® Odometry Pod (SKU: 3110-0001-0001). The two rows of 50A durometer rollers have excellent traction on soft floor tiles, such as those used in the First Tech Challenge (FTC).