4 - Pk. BowJax Super SlipJax Dampeners. The future of compound bow manufacturing calls for faster and faster bows... ...shouldn't your string dampener be designed with that in mind? Meet the Super SlipJax Dampener. With a robust design and 13-grain weight, it's created to be strong and lightweight to keep up with today's high-performing crossbows! Order Now! 4-Pk. BowJax Super SlipJax Dampeners