Stable Triangle Design: Triple protection to keep your sheets taut every day, without having to readjust them every night Durable and Stronger: The nylon elastic bands have strong metal clips for the most demanding uses. Easy to apply and remove, keeps corners in place and no more wrinkled sheets Adjustable Length: Allows you to stretch your sheets as you wish, possibility of adjusting them from 9.5 cm to 15.5 cm to adapt to all sizes of sheets. The plastic stud in the middle helps protect the fabric from being damaged,Specifications:Bandwidth: 25 mm Length: 20~50cm Many Uses: Perfect for Futons, mattresses, inflatable mattresses, foam mattresses, but also for tablecloths, barbecue covers, car / boat / motorcycle / scooter seat covers, chair covers and more,White Delivery quantity: 4 rooms