The mat that you want for cutting strips is called the June Tailor Shape Cut ruler. There's also a Shape Cut Plus and a Shape Cut Pro. The Pro version has cutting slots every 2 1/2 inches. The Plus version is smaller but has slots every 1/4 ". I have the Shape Cut Pro and used it for the first time recently to cut jelly roll strips and charm squares from yardage for the Jacob's ladder. It worked great and I really like it. I think the Plus version might be more versatile because you can cut more varied sizes with it. You can find these at JoAnn's Fabrics, Wal-mart, Hobby Lobby, and probably at most local quilt shops.
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