Have your sewing projects been bogged down because you could not find matching zippers? Did you get frustrated when the hidden zipper on your pillow gets stuck and becomes hidden? This pack of invisible zippers is able to make your sewing experience much more pleasant! The zipper teeth are concealed under fabric and the bottom ends are glued together. The zipper construction has no metal at all except the slider for easy sewing and size adjusting. The array of vibrant colors is easy to match different materials such as fabric, leather, or even plastic. The zipper pulls are without sharp edges and zip fluently, free of catching or snagging. The polyester zipper tape is preshrunk and colorfast.