Auto Fanatics Mop Head Unit is made of a hard rubber body for durability. The mop head unit is full 9 ½” in diameter to cover more area per pass. We added a soft rubber molding on the outer edge of the mop head to prevent the mop head from cutting though the bonnet and making scuff marks if the user applies to much pressure or accidently hits the vehicle with the car wash mop head. Now made with a premium swivel head allowing you to wash at any angle.