MATERIAL - The curtain rings are made of durable metal that can support the weight of the curtain. 20 pieces in the package, enough for daily life and replacement DIMENSIONS - The inner diameter of these metal curtain rings is 38mm, suitable for curtain rods up to 33mm. Please pay attention to the correct size when purchasing. EXCELLENT DESIGN - Our curtain rings are chrome plated, polished and have a smooth burr-free surface to catch your curtain, no snagging, pulling and tugging of the curtain. WIDE APPLICATION - widely used for most kinds of curtains, such as window curtain, bed curtain, shower curtain, door curtain. EASY INSTALLATION - The curtain rings go through the curtain rod one by one, and the curtain hooks in the small ring, then you can try to move the curtain slightly.