The Madam Sew Clapper is a perfect pressing tool for helping both sewists and quilters achieve flatter seams, hems and creases (think pleats). The clapper helps to set a fabric fold and keep it flat, sharp, and crisp. A clapper is especially helpful when you are working with a delicate fabric that you can’t iron such as sheers or velvet. Or heavy fabrics like wool or denim. But it is equally useful for other fabrics. The clapper is a tool that has been used by professional tailors and seamstresses for a long time. It is perfect for pressing those little tight spots without getting your fingers burned. Seasoned quilters use clappers to help get their seams to lay flatter and crisper than an iron can make them especially when you have several seams meet.