Secure and Stay in Place: These bed sheet holders are designed to eliminate slipping and wrinkling, ensuring a tight fit against mattress corners. Ideal for thin mattresses, they are not recommended for thick mattresses, adjustable beds, or silk sheets. Enhanced Grip with Anti-slip Particles: Equipped with anti-slip particles on the bottom and outside, these bed sheet holder straps securely grip the sheets without being overly tight or difficult to remove, providing a hassle-free sleeping experience. Effortless One-Time Installation: Easily install these bed sheet fasteners without the need to lift or flip the mattress. Once set, they maintain a firm hold on your sheets, simplifying removal and reinstallation during laundry days. Universal Compatibility: Our adjustable bed sheet grippers are designed to fit all mattress and bedsheet sizes. Invisible under the bed once installed, they work effectively with twin, double, queen, and other bed sizes. Gentle on Fabrics: The corner fitted sheet holders are crafted from soft materials that securely hold your sheets without damaging the fabric. This set of 4 PCS ensures your mattress remains tightly fitted, no matter how much you move during the night. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Grey Material:Silicone Package Contents: 4 * Bed Sheet Fasteners 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.