Set of 8 clips to prevent slippage of sheets, box covers, etc. Purchased on Amazon last October. 5 of these are unused. The main body can be adjusted from approximately 27cm to 53cm with the plastic adjusters (see photo 2). The band part is made of rubber, so you can adjust the sheets to your desired tension. The clips are made of stainless steel and have plastic protectors in between to prevent damage to the sheets. Also recommended for those who are concerned about wrinkles in their sheets caused by tossing and turning. I used these for a short time to prevent box sheets from slipping. I changed my sheets, so I'm offering them to someone who can use them.