Blackout thermal insulated curtains are made of 100% polyester which makes them super soft to the touch. Bright dark colors enhance the beauty and suit any home style. High-quality stainless-steel eyelet. Diameter approximately 1.6" (4cm). These heavyweight eyelet ring top thermal curtains will transform your room with their blackout qualities and unique super soft drape material. Easy to hang on a curtain pole. These curtains are perfect for energy-saving, light-reducing, and noise-reducing functions. Our triple weave blackout tech fabric is a light and flowing material with a special hidden layer that blocks out light for a restful sleep. Darker colors such as Black, Dark Grey, Navy Blue, Red, and Yellow will provide a higher level of blackout. Lighter colors such as silver will naturally block out slightly less light. These curtains are made of polyester which is soft to the touch and effective in blocking 85% to 95% of sunlight. The front and back fabric are of the same color with high-density black yarn woven in between. Machine washable on low heat. Do not tumble dry to avoid creases and damage to the eyelets. Do not bleach. Iron on low heat.