COMFORTABLE AND ADJUSTABLE: duty sheet straps have elastic and adjustable sheet strap clips for a more comfortable sleeping experience. 12 snap-on clips adjust strap length to fit all edges of the sheet, ensuring a every time. Stable and Durable: The strap is made of high-quality elastic nylon and metal clips, providing multi-directional stability and durability. The snap-lock clips are stronger than regular clips and keep the sheet in place without readjusting. Plus, they 't damage your sheets, ensuring long-lasting protection. HIGH QUALITY AND HARMFUL: The fitted sheet corner rack is designed with metal buckle clips and built-in plastic fastening system to protect your sheets from harm. It can hold your sheets tightly without worrying about them loosening, ensuring high quality and harmless use. VERSATILE AND EASY TO USE: The sheet fastener is compatible with all size sheets from small to king and fits different size mattresses including twin, full, full XL, queen, king and king. In just three easy steps, you can say goodbye to frustrating, wrinkled sheets that 't be fixed and make them versatile and easy to use. Colour:black+white Material:polyester Size: 20 x 10cm Package Contents: 4 x Sheet fixed device(2black+2white) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.