wrapped v belt classical v-belt uses NR,SBR or CR as main rubber material, polyester cord as framework material. wrapped v belt classical v-belt uses NR,SBR or CR ... as main rubber material, polyester cord as framework material, produced strictly according to the standard ... , 3L, 4L, 5L,SPZ, SPA, SPB, SPC,3V, 5V, 8V wrapped v belt classical v-belt