Fits REV-XP, REV-XR, REV-XU, REV, REV-XM, REV-XS, S-CHASSIS Not cogged 600 ACE High performance drive belts calibrated to maximize your sleda?s performance Aramid tensile cords used in construction for extra long life and dependability, also delivers a consistent length with minimal belt shrinkage and minimal length adjustments High Performance drive belts calibrated to maximize your sled’s performance. Aramid tensile cords used in construction for extra long life and dependability also delivers a consistent length with minimal belt shrinkage and minimal length adjustments. High tensile reinforced fiber elastomer undercards provide minimal dusting and long term flex life. Flex weave over cord for superior adhesion and crack resistance. Consistent performance during life of belt. Quality you can count on for optimum performance. Built with distinctive durability features for mountain, trail or fast tracks.