Poly V belts, also known as multi-rib belts or micro-V belts, are a type of power transmission belt commonly used in automotive engines and industrial machinery. These belts feature multiple longitudinal ribs or grooves on their inner surface, which mesh with corresponding grooves on the pulleys they are in contact with. The ribs provide increased surface area contact between the belt and pulleys, resulting in improved traction and reduced slipping, even under high loads and speeds. Poly V belts are typically made from a durable rubber compound reinforced with synthetic fibers such as polyester or aramid, which gives them excellent resistance to stretching and wear. They are known for their quiet operation, high efficiency, and long service life, making them ideal for demanding applications where precision and reliability are essential.