Permanent Matched Set. No lateral whip, spin or jump-off. Deep pulley grooves are not required even on horizontal drives. Heat and Oil resistant.Features : Permanent Matched Set. No lateral whip, spin or jump-off. Deep pulley grooves are not required even on horizontal drives. Heat and Oil resistant. Construction : Tie-band. Rubber impregnated cross woven cotton-polyester fabric. Cushion rubber. Low Stretch high modulous adhesive activated polyester cable cord. Compression rubber.