RSI Extended Grip Heater Kit for bars with built-in hooks. These are the hottest grip heaters in the business. They outperform oem Ski-doo heaters by a mile. They now have the factory deutsch pins installed so its a simple easy installation into the factory ski-doo plug. Choose fitment for Ski-doo XP,XS,XM or the 2017-18 REV GEN4 850 as the pins are different for the 2 models. Sold in pairs.