Material: the ironing elastic fasteners are made of sturdy metal clips and heavy duty elastic bungee cords, which will grip your ironing board or ironing sheets firmly and will not break easily Applications: great for ironing board covers, bed sheets and mattress covers, tablecloth clips, fitted sheet holder, bed sheet holder straps, bed sheet corner clips grippers straps, adjustable elastic sheet straps grippers, sheet straps grippers Size: the length of sheet clamp is 20 - 30 cm/ 8 inch - 12 inch; High elasticity provides more stable and stronger grip for heavy duty purpose; The extensibility about 35 - 40 cm is appropriate for many different size ironing board covers bed sheets and so on Convenient to use: the adjustable bed sheet strap is easy to put on, keeps bed corners in place, never worry about messy or wrinkled sheets again Package contents: 12 pieces white elastic ironing mattress corner straps, enough quantity for your daily use