Speedmaster gilmer drive kits are aluminium machined and precision"made for your street/race engines. Eliminate your belt throwing problems. Speedmaster gilmer drive belts are designed to keep your accessory drive operating properly. They provide higher power and torque transmission, improved meshing to reduce tooth jump, greater resistance to tooth shear, and reduced friction to extend their life. The belts use a fiberglass cord wound across the entire width of the belts to minimize stretching. Speedmaster gilmer drive belts are manufactured from a synthetic neoprene compound that resists heat, oils, ozone, and aging. Tough nylon fabric is then bonded to the tooth surface for greater wear resistance.