Wonder Clips are a great alternative to pins, especially when working with quilt bindings, heavy weight fabrics and vinyl. The wide opening offers a large holding capacity and for holding multiple layers without damaging or distorting your fabrics. The backside is flat and clear with 1/4 inch markings. The flat surface allows them to glide smoothly and easy feeding to the presser foot. The neon color is useful when working with dark colored fabrics and are easy to find when dropped on the floor! Wonder Clips are great for keeping binding in place, but can also be used for attaching handles to handbags, holding quilt blocks, and for other crafting needs. We have received neon green, red and rainbow!