Jumbo Wonder Clips have great holding capacity for many crafts. Clip opens wide to hold layers of fabrics. Jumbo wonder Clips are a great alternative to pins, especially when working with vinyls, piles, and heavy weight fabrics. The flat back of the Jumbo Wonder Clips have seam allowance marking for ¼ €?in, ½ €?in, 3/4 €?in, and 1 €?in.