Each pack includes 10 Wonder Guard sheets that can be reused indefinitely. (5cm x 13.5cm). Fits regular spools and cones. Tired of your spools tangling and unraveling and making a mess? Wrapping Wonder Guard snugly around your spools tidies loose threads and stops it from unwinding and tangling. It also keeps your thread clean and prevents it from drying out. This multi-purpose thread guard can also be attached loosely around spools of thread while in use on a machine for a consistent draw, helping to maintain beautifully even stitches with no fuss.