Designed to harness the horsepower of new high-torque enginesHeavy heel design and special weight profile provide greater shift force for improved acceleration and top speedUnique design provides responsive backshift performanceAdjustable by adding tuning rivets (up to 6 grams per weight)No clutch modifications necessaryTo order, add 4 grams to the amount of weight you are currently using to choose the correct MTX weight (i.e.: if you are currently using a 10-64 Polaris weight, you should use a 68 gram MTX weight)Weights sold in sets of three, including six 1 gram, six 2 gram and six 3 gram rivetsReplacement rivets sold in packs of six