Stretcher bars reduce warping and help keep your needlework projects square while stitching. One pair of wood stretcher bars comes in each package, and any two sizes can be combined to create the dimensions needed for your project. New Heirloom stretcher bars feature size branding on each bar for easy organization, smooth interlocking corners, and compatibility with tacks or staples. They are also compatible with other standard stretcher bars, including those from Edmunds and Colonial Needle, making it easy to expand your existing frame collection.