Top Width-5/8 inMaterial-RubberOutside Length-55 inHeight-35/64 inNumber of Ribs-32.5VX550/03 Banded Cogged Belt, 55 in Outside Length, 5/8 in Top Width, 3 Ribs 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.23Oil and Heat resistant.