All the rebound with no control has a great effect on stability and adjustability. If you try to tighten your trucks with no damping, a lot of the time the bushing just squishes, and you get no more tension. SHR => Super High Rebound! 40% higher rebound than the classic formula. Blood Red, 91a. - Sold as indivual bushings! - 2 Bushings Needed per truck - 4 Bushings Needed per complete board