Eyotool Rustproof 304 Stainless Steel Shower Curtain Rings Curtain Hooks with Premium Acrylic Beads Decoration Set of 12, Black Material: 304 stainless steel and acrylic. Rustproof and durable. The color is Black Inner diameter: 1.38 inches/35mm. Inner Length: 2.76 inches/70mm. They will glide smoothly on the shower curtain rod, and will not rusted. Easy to install, just attach your shower curtain and slid the rings onto your rod. Suitable for all rod that smaller than 1.38 inches/35mm diameter and wont fall off