for backing for pieced borders, (like a piano key where you have bias that will stretch,) for backing for turned applique, it can be printed on when ironed on freezer paper, to make durable patterns, for paper piecing, its like a light to medium weight interfacing but is 36" wide & about 60 cents per yard on sale. Not fusible but could use spray adhesive or washable glue. Sounds like I should be selling it.lol