Fabric PREMIUM MATERIALS: Composed of premium quality nylon bungee band, plastic buckle and stronger metal clips; with the pursuit of excellent quality, were strictly tested to make sure every bed sheet fastener in a good working condition. ADJUSTABLE & ELASTIC: Our sheet fasteners can be adjusted from 19cm (7.5inch) to 33cm(13inch), the max stretch length up to 70cm(27.6inch), extra wide elastic bands can bear stronger tension, keep your sheets in place and neat, its time to say goodbye to messy or wrinkled sheets. SIMPLE OPERATION: Easy to install and remove with a few steps, the stronger metal clips bite extra edges and corners of the sheets tightly and securely, let you hassle-free about the frequent sliding. PRACTICAL BED SHEET FASTENERS: Widely used to help secure flat / fitted bed sheets and other covers like mattress pads hospital bed, sofa cushion, mattress pads, tablecloth covers, chair / boat / car / motorcycle seat covers, ironing board covers mattress pads, tablecloths, slipcovers, etc.; very practical and useful for daily use.