This black plastic pulley is 50mm in diameter. It has a metal housing and hooks at the top and the bottom.
PRODUCT WARNINGS
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 www.P65Warnings.ca.gov.
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.