Elastic Fitted Sheet Stretcher, Adjustable Retainer Strap Fastener for Bed Sheet, Sofa, Ironing Cover (White, Pack of 4) Fixings for the ironing cover and the traps have plastic washers that do not damage the fabric. Adjustable length allows for desired tension. Set of 4 stretch stretchers: original length is 16-25cm, stretchable up to 33-53cm. Easy, quick to change and perfectly secure. Designed to hold the ironing board cover securely in place, ensuring a smooth, wrinkle-free surface for much better results. Suitable for ironing boards, seat covers, couch covers, sheets, cribs, mattresses, blankets, quilts, tablecloths, etc. Sheet or cover ironing taut thanks to these 4 tensioners! With plastic coated metal clips, they keep the ironing sheet or cover securely in place. Note: The data is all measured manually, please allow 1-3cm error, due to the difference of light and display, there will be a certain color difference, the actual object received shall prevail.