These single, wrapped V-belts give premium belt performance. The belts are constructed of highly engineered, high performance components. The components are manufactured using the latest in belt technology available on a global basis. The outer fabric wrap is treated with highly oil and heat resistant, engineered synthetic rubber compound, specifically compounded for excellent wear resistance, proven through thousands of hours of testing. The helically wound tensile cords are specially engineered, twisted, heat and chemically set, polyester material. The body rubber compound is a highly engineered synthetic rubber compound, specially compounded for cool running, flexibility, crack resistance, and excellent bonding to the outer fabric and tensile cords. The belts exceed USA RMA published ratings levels. All 3L, A or 4L, B or 5L, C, D, 3V, 5V and 8V belts are manufactured to meet RMA standards for length and dimensions.