Nylon, Metal Superb Materials: Our bed sheet straps are made of highly elastic nylon and durable metal clips. Rust-proof metal clips protect fabric from damage while maintaining secure tension on adjustable fitted sheet straps Hollowout Triangle Design: The triangular shape provides unparalleled stability! The sheet clips feature a hollow triangle design to prevent elastic from slipping. Reinforced metal clips hold your sheets securely in place, preventing them from sliding off the mattress Adjustable Size: Fitted sheet straps are adjustable in length and are perfect for all bed sizes from twin to king. Adjustable tension provides a tight, custom fit, keeping your sheets securely in place and your bed looking neat and tidy Easy to Install: First open the clip, then put the sheet into the clip, finally adjust the length, press the clip with the sheet to complete the installation. Bed straps for sheets can fit all edges of the sheets Wide Compatibility: Suitable for fitted and flat sheets, fixing various bedding, also suitable for tablecloths, sofa covers, chair covers, grill covers, car seats, boat seats, motorcycle seats, scooter seats, etc