This is the PVC brush used on many Maytronics / Dolphin / Davey robotic pool cleaners.
This brush wraps around the wheel tube. It has 13 square tabs extending from one side each with a small hole. The opposite side has 13 matching extensions. Once the brush is wrapped around the tube, these extensions fit through the corresponding hole on the opposite side to hold the brush in place.
315mm x 70mm (Doesn't include the square tabs)