The Dupont Slides with their Vespel Inserts were engineered for snowmobiles that were notoriously hard on conventional Hyfax wear. At three-to-four times the cost of conventional slides, they quickly pay back your installation labour as they last four (4!) times longer than conventional Hyfax. PLUS, during this extended service interval (3rd season and counting on my sled) you can enjoy less rolling resistance, better fuel economy, and higher speed, plus the reduced stress when you get caught on the shoulder of a long road or on a smooth straight railway line at 25 below when there is NO lubrication generated from the side to side motion of normal cornering. We have current fitments for Yamaha/Arctic Cat, Polaris and SkiDoo (not all models and years)