MaterialLightweight and sturdy ABS plastic material, wear resistant, corrosion resistant, durable to use, it will not lose color and better than metal and nickel onesize32 pcs curtain ring.Inside diameter: approx. 4cm/1.6",outside diameter: approx. 7cm/2.8" These eyelet curtain are designed for curtain rod with 1-3/8 inch diameterInstructionsThe diameter of the holes which is cutted on the fabric is 51mm/2". No tools needed for installing, together easily by pushing one half into the other.FeaturesBuilt-in nanoscale silencing ring, to smoothly slide on curtain rod and protect the rod with low noiseApplicable Use for DIY to decorate your fabric, bags, shirt, shoes, curtain, drapery, pillows etc.Great accessory for window curtain rod, window curtain ring, shower curtain ring, locker room door curtains ring, DIY backpack hole bag ring.