These were custom-made rails used for a window with dimensions of 170cm (width) by 203cm (height). They were used for about five years, so there are some loose threads. It's at a level you probably wouldn't notice normally. Please refer to the photos, especially the 9th photo. They are Grade 1 blackout curtains and are fire-resistant, so they are very sturdy! They cost about 50,000 yen per set, so this is a bargain. Please purchase only if you understand the above. They are being sold at a bargain price due to some damage. This is a set of 2, so there are 4 panels in total! The 7th photo shows the backing fabric.