Slam Specialties SS Series Air Bag "The Original Slam Bag" Slam Specialties SS Series airsprings incorporate engineered composites and alloys, with proven encapsulation designs to bring a lighter, high-performance airspring to the market. Up to 40% lighter than our other models as we as weight savings over the competition. Saves your shipping expense and reduces your unsprung weight. 6061-T6 Billet Aluminum Ports. CNC-Machines, Molded-in and sealed to the plate. Wont Spin or pull out. These are NOT your off the shelf inserts. Designed and built specifically for the SS series of Airsprings from Slam Specialties. 6061-T6 Billet Aluminum 3/8"-16 inserts integrated with the inner plate to provide a solid and positive mounting solution that resists corroding and exceeds the thread strength of our RE, HE, and XS series airsprings. One-piece composite inner plate with built in bump stops provide superior strength and minimum height protection for the 250psi bellows. Impact-modified, non-marring outer plate provides a durable mounting surface that won’t corrode or scratch your frame. Solid Steel hoop rings and TIG welded girdle rings for the fail-proof enclosure system and bellow support wont lose their shape or distort. Since 2001 – Proudly made in the USA from all USA made materials. Available in 5", 6", 7", and 8" Sizes – Single ½" Port Only.