Support rollers are the kind of gears that provide support to cable and other related products. They are used to muffle vibration noise. Many support rollers in web manufacturing plants are driven to rotate by the friction between the roller surface and the web. At higher speed operation, air film between the roller surface and the web can be large enough to cause slippage. Therefore, it is important to keep the friction torque of the roller bearings very small. Putting rollers close together can decrease pulling tension.