MATERIAL - Made of iron material and coated with anti-rust silver coating, which gives these metal rings a stylish and smooth silver glossy finish, thus our silver curtain rings are flawless, burr-free, clean, and tidy. PACK - You will get a total of 100 pieces metal curtain rings and they have a 37mm inner diameter, which is for accommodating 30mm thick curtain rods. EASY TO USE - The easy way to hang these curtain hoops is to put your curtain flat on the ground, insert the hooks into the header tape, slide on these rings, and using your fingers put them into all the rings and then lift the curtain up and slide it onto the curtain pole. STRONG BEARING - These curtain pole rings are designed to hold heavy curtains or drapes for hotels, offices, homes, and more. Our metal curtain hooks can help reduce heavy slippage, thereby eliminating curtain tearing, tugging, and pulling.