The King Kutter Idler Pulley Pack of 4 is designed for 4', 5', and 6' RFM Series Finish Mowers. Made of steel with a silver color, these 4-inch diameter idler pulleys are powered by gas and operate at 12V. Manufactured in the United States, this set of four pulleys is essential for maintaining the proper functionality of your lawn mower. Ideal for various mowing needs, this product ensures durability and reliability for your outdoor maintenance tasks.