Wrapped Construction Single Belts have an outer fabric wrap treated with an engineered synthetic rubber compound that is extremely resistant to oil and heat; specifically designed for excellent wear resistance and proven through thousands of testing hrs. The body rubber compound is a highly engineered synthetic rubber compound; created for cool running, flexibility, crack resistance and excellent bonding to the outer fabric and tensile cords. BESTORQ® Wrapped V-Belt, Classical, B Section Size, 0.64 in Top Width, 103 in Outside Length, 0.44 in Thickness, 1 Ribs, 3.4 in Minimum Pulley Dia, Synthetic Rubber