This product is a set of 10 heavy-duty steel pulleys, each weighing 4 oz. Made in the United States, these durable pulleys are perfect for use in various tools and equipment, such as block and tackle systems or pulley-based machinery. With their high-quality construction and domestic origin, these pulleys are reliable and built to last for extended periods of time. Ideal for professionals or hobbyists looking for sturdy and dependable pulley components.