KiwiGrip rollers let you vary the texture of Kiwigrip non skid coating, from fine to aggressive depending on the amount of surface traction desired. Loopy Goopy rollers are unique and proprietary to KiwiGrip, and the only type of their kind available. Choose from 3 inch and 9 inch sizes. For best results, the 3 inch size is recommended. However, the larger size works well on larger boats.