Coil zippers can be developed in a wide range of sizes and styles, from invisible zippers, which disappear into dress seams, to the large, apparent coils on duffle bags. The tape can be dyed to perfectly match the color of the fabric on clothing, making coil zipper ideal for fashion forward looks, from evening gowns to day dresses. Furthermore, coil is generally the strongest zipper construction, at any size. The strength comes from the tightly placed elements of continuous coil plus its unique ability to “self-heal” if accidentally opened behind the slider. All these qualities make coil zippers an exceptional choice for hefty products such as backpacks, handbags, and luggage.