This item is used as sheet fasteners and never worry about messy or wrinkled sheets again. The built in plastic clenching system protects fabric from harm. It is easy to put on and keeps sheets in place and length allows desired tension. This product fits to fitted or flat sheets on different type of beds such as standard size, odd shaped beds, beds, beds, air mattresses and travel trailers and more. They are easy to use and keep your bed looking great at all times. Features - Color: Black - Material: metal and cloth - Size: relaxing state: 100-150cm stretching state: 200-250cm - Built in plastic clenching system protects fabric from harm. - Built with round elastic, plastic clamps with fabric protector and unique heavy duty bungee cord lock. - Easy to put on and keeps sheets in place and no more fixing sheets, length allows desired tension. - Fit to fitted or flat sheets on different type of beds such as standard size, odd shaped beds, beds, beds, air mattresses and travel trailers and more. -They are easy to use and keep your bed looking great at all times. Package list: 4 x fasteners