Zipp and Slide's premium presser foot range comes in a reusable small aluminum can. The set contains 3 sewing feet for all common sewing machines with a snap-on shank. The sewing feet can be attached without any additional tools. You get 3 Premium Zipper Sewing Feet, one for narrow zippers, one for wide zippers and one for invisible zippers. So you always have the right sewing foot for your project at hand. The sewing feet are made of metal, very stable and durable.