Top Width-21/32 inMaterial-RubberInside Length-310 inOutside Length-313 inHeight-7/16 inNumber of Ribs-1672.B310/16 Banded Belt, 313 in Outside Length, 21/32 in Top Width, 16 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.66Oil and Heat resistant.