There are 50 curtain rings to prevent corrosion and rust. The size is 70mm x 40mm. Essential accessories for curtain rods, curtain rings, shower curtain rings, changing room curtain rings and DIY backpack rings. The plastic grommet has a built-in nano-ring that reduces friction with the curtain rod and pulls more smoothly and quietly. It is suitable for children's rooms, bedrooms and study rooms. Features Material: Plastic Color: matte silver Inner diameter: approx. 40 millimeters. Outer diameter: approx. 70 millimeters Package included: 50 pieces * curtain eyelet rings. Note: Clean the surface with a cloth.