The Wonder Clips are great alternative to pins, especially when working with heavy weight fabrics, piles and vinyls. They can hold layered sections of sewing projects such as handle connectors to handbags and piping without distortion. It holds quilt binding while sewing and it's easy to see and easy to find when dropped on the floor. 1/4 inch and 1/2 inch seam allowance markings on on the base of clip of clip. Clip base is flat for easy feeding to presser foot.