Variable speed belts, also known as V-belts, are flexible power transmission belts commonly used in machinery and automotive applications to transmit power between two rotating shafts. Unlike traditional fixed-speed belts, variable speed belts feature a tapered design that allows them to change their effective diameter, enabling smooth operation across a range of speeds. These belts are typically made from rubber or synthetic materials reinforced with fibers, providing high tensile strength and resistance to stretching and wear. The variable speed capability of these belts is achieved through their unique shape and construction, which enables them to grip the pulleys tightly at different positions along their length, adjusting the transmission ratio as needed. This versatility makes variable speed belts ideal for applications where precise speed control and smooth power transmission are required, such as in industrial machinery, lawn and garden equipment, and automotive engines.