Unstretched the piece is 4 inches wide and 5.25 inches long. It will stretch to fit a medium-sized round glass ornament. (Mine is 9 inches around the center.)

This is a great one for using just a little bit of yarn.

This pattern was on About.com (which no longer exists) and has been deleted from their site, but for now it can still be found on the Internet Archive. They redirect and delete pages a lot so you may want to download/print to save.