The RolDri Master Replacement Roller is a durable polyvinyl alcohol (PVA) 36" roller that outperforms the competition

air-infused composition of Sorbothane with heavy-duty cushioning

With one of the thinnest gauges around at 20 gauge

Great for use on:

That's heavier than if it was filled with concrete

Oncourt Offcourt Radar Coach COLLECTION-Type-Clothing The RolDri Master Replacement RollerSee how hard you're serving with the Oncourt Offcourt Radar Coach! This device provides radar feedback to help you improve one of the most important skills in tennis. Important Warning: Never aim directly at the Radar Coach without having a net or other protection guarding the unit.