You can cut a perfect circular window in a card or envelope with this Sizzix Movers & Shapers Die Set. There are three different sizes of circles included in this set. They are designed by Tim Holtz. Because they are magnetic, they can easily be positioned wherever you want on your cutting surface. Please note that these dies require the use of a Movers & Shapers base die or base tray (not included). They are designed for use in a BIGkick, Big Shot or Vagabond machine (a Cutting Pad and a Crease Pad are also needed). All items are sold separately. For even more creative options, pair these dies with the Pocket Watch Frame (sz-658571), not included. When cut, your circles will range in size from 3" x 3" to 1 1/4" x 1 1/4".