METAL - The shower curtain rings are made of , high quality metal. Coating plated on the cover of shower curtain rings let you use in humid environment bathroom. PLATED & POLISHED - The metal is plated and polished on the cover to improve rust resistance. These shower hooks are also used as elegant decor to your bathroom. HEAVY DUTY CLOSING HOOKS - These metal shower hooks are strong enough to hold a heavy shower curtain. Sealed-shut design makes them prevent curtain from slipping off the rings. EASY TO GLIDE - Engineered spherical roller balls of shower curtain hooks reduce friction and let hooks glide across the rod smoothly with no effort at all. for a standard 60 inch or 72 inch opening.