WINertia AV Aluminum Dead Shaft Idlers have built-in "Air Vents" that remove trapped air 7.5 times faster than any other Idler Roll on the market. With 15 times the air parking capacity, our vented Dead Shaft Roller maintains constant traction. It eliminates the web problems of scratching, slipping, bunching and side to side movement.The WINertia AV outperforms spiral grooving, cork, rubberized tapes and standard idler rolls. The WINertia AV can be used in most idler roller applications. Utilize the AV Roller in encoders, re-winders, high speed printers and converting equipment with running at speeds of 500 to 3400 FPM. Independent 3rd party test results prove that the WINertia AV Aluminum Dead Shaft Idlers maintain constant web traction across multiple web speeds. Idler rolls equipped with other technology lose traction and slip due to the trapped air between the web and the idler roller, but that's not a problem with our WINertia AV Idlers.