Avon Super Sport Air-SS Grips With Throttle Assist For Harley With Dual Cable Throttle Avon Super Sport Air-SS Grips incorporates a system of air pockets inside the grip to dampen vibration. Does not have any surface bumps, rather a consistent surface diameter with Avon's popular knurl texture. Incorporates an air cushion system that will reduce some of the unwanted vibrations. Features: Expanding on Avon's popular line of cushioned grips, the company introduces its next generation, the Air-SS Similar to the original air cushioned grips, the Air-SS incorporates a system of air pockets inside the grip to dampen vibration from the ride The Air-SS grip however, does not have any surface bumps, rather a consistent surface diameter with Avon's popular knurl texture Rubber with an O.d. of 1.50 Made in the USA