Gates Micro-V Stretch Fit Belts, with exclusive self-tensioning technology, are the first and only Aftermarket belts engineered to fit like a glove and perform properly on these unique stretch fit drive systems.Patented highly engineered EPDM belt ribs are extremely resistant to oil leaks, wear and pilling.New TwistLock technology provides the strength and flexibility of advanced polyamide tensile cord.Specially formulated adhesive literally locks on to the cord - allowing the cord to elongate and stretch, but never lose tension.Prior to installation, Stretch Fit belts are shorter than the actual working length, but once installed they automatically tension - maintaining the proper tension over the life of the belt and ensuring optimum load-carrying capacity.