The tensile cords are manufactured with the highest quality Kevlar.
81 x 101in OC, 16 Band D&D DURA-ULTIMATE BAND CLASSICAL belts meet or exceed USA RMA published ratings levels. These high-quality cords are extremely resistant to severe repeated shock loads. The body rubber is a highly engineered synthetic rubber compound, specially compounded for cool running, crack resistance, and excellent bonding to the outside fabric and tensile cords.