THe INTERROLL PolyVee Belt conforms to the ISO 9981 and DIN 7867 standards, and fits excellently with RollerDrive. Belt features roller pitches of 60, 75, 100, 120 and 125 mm, a flexible belt core (eliminating the need for a belt tensioner) and offers significant increase in torque transmission, when compared to standard O-rings. The belt accelerates or decelerates with ease. The belt can be ordered in 2-rib or 3-rib versions.