Formulated specifically for PVC pipelines, these wheels work well in all slippery pipes. Designed to avoid damaging the pipe wall, they utilize a granulated rubber composite which improves traction without cutting into the pipe surface. Over time they will wear, and become even more effective. If you are a contractor or city who inspects new PVC or pipe with FOG (Fats, Oils, & Grease) then you need a set of our granulated rubber wheels.