The ironing board cover clips and catchers are equipped with plastic discs that won't damage the fabric. The adjustable length allows you to set the desired tension. Set of 4 stretchable elastic cords: the original length is 65-130 cm, the maximum extension length is 200 cm. If you want to extend the service life, try not to exceed 220 cm when using. Designed to hold the sheet firmly in place, ensuring a smooth and wrinkle-free surface for better results. Easy, quick to change, and absolutely secure. The extra-long size makes them more suitable for some relatively large items such as sofa covers, bed sheets, cribs, mattresses, blankets, comforters, tablecloths, etc. Keep your bed sheet or sofa cover taut thanks to these 4 tensioners! The plastic-coated metal clips hold them securely in place.