This flat idler pulley is an original OEM part sourced directly from the manufacturer, Husqvarna. It is sold individually. A flat idler pulley is used in conjunction with the belt to transfer power from the engine to the machine, specifically designed for use with outdoor lawn and garden power equipment such as lawn mowers. It is compatible with mowers by brands such as Husqvarna, Poulan, and Weed Eater.The flat idler pulley part is crucial for the proper functioning of the lawn mower. The purpose of the the flat idler pulley part is to connect to the idler bracket. When this process functions properly, the flat idler pulley will then apply tension to the v-belt. The replacement or repair process of the flat idler pulley should be straightforward, although the user replacing the part should plan on using a wrench. Always be sure to wear gloves during any assembly, replacement, or installation processes. The user should also refer to the owner's manual of their equipment and any guiding diagrams that clarify the placement location.This flat idler pulley is made out of metal.