These pulleys are made of black plastic, have a metal housing, and have hooks at the top and the bottom. All wheels are 50mm in diameter except for the smaller wheels on the tandem models. We offer several varieties in both parallel and tandem styles.
WARNING: This product can expose you to chemicals including styrene, nickel, and lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to .
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.