Description: Made of ABS+Plastic material,durable,safe,eco-friendly. Suits all mattress, holding the fitted sheet,easy to put on and keep your sheets tight on the bed. Anti-skid design,simply insert the sheet holders under the mattress, press the button and secure it.Never No needs to worry about messy or wrinkled sheets again, eliminate the slipping of any bed sheets with these sheet fasteners. Multifunctional bedding accessories, can be used for sheets of different size beds, mattress strap queen, king size bed and double bed. Specification: Material:ABS+Plastic Size(LxWxH):Approx.10x2.5x17.5cm/3.94x0.98x6.89inch Package Includes: 4 Pieces Sheet Holders