These pulleys are made of low-friction aluminum, 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.
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.
California Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.