Top Width-21/32 inMaterial-Kevlar (Aramid)Inside Length-235 inOutside Length-238 inHeight-7/16 inNumber of Ribs-12.B235K V Belt, 238 in Outside Length, 21/32 in Top Width, 1 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.45Oil and Heat resistant.