and will not rust: the silver metal curtain ring is made of durable metal, a non-porous surface and therefore will last for years without rusting. Eliminate Scratches - Polished surface and no burrs to snag the curtain, eliminates snagging, pulling and pulling of the curtain. Pack of 40 Metal Curtain Rings, Hanging Rings for Curtains and Rods, 30mm Inner Diameter High-strength curtain ring: make the most of the high-strength metal and strict design, the bearing is good and will not suddenly deform and fall off. Apply widely: curtain rings are silver, widths apply for most types of curtains, such as shower curtain, window curtain, french window curtain, etc.