ADJUSTABLE AND ELASTIC: Our sheet fasteners have an adjustable range of 16 cm to 31 cm, with an impressive maximum stretch length of 68 cm. The wide elastic bands are designed to withstand strong tension, keeping your sheets in place and looking neat. Suitable for cribs, twin beds, full beds, queen beds, king-size beds, and California king-size mattress protectors. Say goodbye to those annoying messy or wrinkled sheets once and for all! PREMIUM MATERIAL: Made with the finest quality polyester elastic, durable plastic buckles, and sturdy metal clips, they undergo rigorous testing to ensure each sheet corner band is in good condition. PRACTICAL MATTRESS BANDS: These versatile bands are a must-have for wrinkled sheets. They are useful for securing flat or fitted sheets, as well as other covers, including hospital sheets, sofa cushions, mattresses, tablecloths, chairs, boats, car and motorcycle seats, ironing board covers, placemats, slipcovers, and more. Practical at its finest! EASY TO USE: Installing and removing our sheet fasteners is easy and only requires a few steps. The sturdy metal clips grip the edges and corners of the sheets, ensuring a firm and secure hold that keeps them firmly in place. Forget about annoying sheets slipping off during cleaning!