A great alternative to pins, especially when working with heavy weight, fuzzy, or vinyl fabrics. Wonder Clips can hold thick, layered sections of sewing projects such as piping or quilt binding without distortion. Clip base is flat for easy feeding to presser foot, and is marked with 1/4" (7mm) and 1/2" (12mm) seam allowance markings. Works well with knit fabric and sergers! 50 clips in a reusable storage box.