Hot Rod Sled Shop Ski-doo PDrive Adjustable weights are now available in 2 base weights. Our weights are 4130 chromoly steel that is precision machined, heat treated , and then electroless nickel plated for the the strongest and finest weight in the business. We then use I-glide German made bushings for zero bushing failers and a 25% closer tolerance on the axle for more precise weight travel as it goes through its cycles. Our weight eliminates the stock clicker system which we believe is a great benefit in even more precise tuning in exact shift locations than the Ski-doo OEM ramps. Our shift curve is different than any stock ramp. It engages a little lower loading the motor a little harder and then aggressively upshifting for quicker acceleration and maintaining more mph with a lower full shift profile. It is similar to a 968 in clicker #4 at engagement and then #1 at full shift. The profile of our HRSS-PDL and HRSS-PDM is the same with justa different base weight. The HRSS-PDL with a weight from 62-74 grams was designed for the REV GEN4 Summit specifically in Winter 2018 and tested in Quebec's Mount Valin, and then Alpine, Wyoming at higher elevation with really deep powder. The HRSS-PDM ramp with a weight from 74-94 grams works really well for low elevation application in both Summit & shorties. All kits and weights will ship with 1.7 gram & 1.2 gram magnets this year for more adjustability. We have complete clutch kits available and kit reviews on DOOTALK.com have been stellar with superior performance over all other kits.