MATERIAL - The curtain rings are made of durable metal that can withstand the weight of the curtain. 60 pieces in package, enough for daily life and spare. DIMENSION - The inner diameter of these metal curtain rings is 38mm and fits curtain rods up to 33mm. Please pay attention to the correct size when purchasing. . EXCELLENT DESIGN: Our curtain rings are chrome plated, polished and smooth surface with no burrs to catch your curtain, no curtain snagging, pulling and tugging. . WIDE APPLICATION: Wide Application - The curtain rings are in black, widely used for most types of curtains, such as window curtain, bed curtain, shower curtain, door curtain. . EASY INSTALLATION -Curtain rings go through the curtain rod and curtain hooks into the small ring one by one, then you can try to slide the curtain slightly. .