Strong Triangle Design: Triple protection design, worry-free of pulling and rolling to straighten the sheets every night. Adjustable and elastic: Our sheet straps come with straps at each end which are firmly attached to the sheets and which are fully adjustable for every bed size and sheet. Quality Material: Made with durable chrome metal ties and white nylon elastic, featured with good elasticity and smooth consistency. Easy to use : tool-free, just hold the mattress and attach the clamp to the edge of the sheet and the length of the strip can be extended as needed. Scope of delivery: 8 pieces High-quality adjustable chain tensioner, ideal for duvet cover, mattress cover, bedding, adjustable bed, murphy bed, camping, tablecloth, iron bedspread, etc.