Stable Triangle Design Triple protection to keep your sheets taut every day, without having to readjust them every evening Durable and Stronger The nylon elastic bands are equipped with metal clips sturdy for the most demanding uses. Easy to apply and remove, keeps the corners in place and no longer has wrinkled sheets Adjustable Length Allows you to stretch your sheets as you wish, possibility of adjusting them by 9, 5 cm to 15.5 cm to fit all sheet sizes. The middle plastic cleat helps protect the fabric from damage,Features:Bandwidth: 25 mmLength: 20 ~ 50 cm 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 Quantity delivered: 4 pieces