Designed to handle one of the toughest jobs in lawn care, Stens OEM replacement belts resist the many stresses that can prematurely shorten the life of a belt.. Stens belts are designed to withstand the rigors of a harsh working environment. Made for real-world working environments, these belts also handle extreme temperature swings from hot to cold weather, and they resist dry rot that can occur when equipment is in storage over the off-season.