H37 Drive On cubes allow easier access to the water surface while maintaining the excellent stability associated with full-size cubes. They are 26cm high at the outer edge, while the center section is lower and shaped just like your PWC hull. The roller is included and centered. This enhances the boat lift experience by allowing your watercraft to roll in and out of your dock smoothly and safely. This system allows you to store your boat, RIB, jet ski or PWC safely and dry out of the water. Not only does it prevent algae growth, but it also protects your PWC from barnacles and worms. Did you know that this also eliminates the need for antifouling?