Graphic Blue-Runner dampener cover is made of specially formulated fibers to insure maximum performance and durability. This list free, pattern free material lasts 4 to 10 times longer than cotton. It's multidirectional manufacturing makes adjustment to the roller a breeze. Specially treated fibers for optimal water absorbancy. Fits rollers 2" (51mm), 2 1/8" (54mm) and 2 1/4" (57mm)in diameter.