Studio Kat Designs 3/4" (19.05mm) Invisible Sew-In Magnetic Snap Closure A wonderful sew-in snap set encased in sturdy yet pliable plastic. Magnetic button for easy opening and closing. Use on bags, totes, backpacks, jacket pockets and purses. Easy to sew over with your machine, making it completely invisible on the outside of the bag. Designed to operate perfectly through several layers of fabric.