Sewing on professional Pro Twill material has never been this easy! Semi-Stitch is Discovery’s famous Pro Twill numbers and letters with an unfinished base. These numbers and letters are pre-sewn together with a “regular” or “regular and insert”. Semi-Stitch comes complete with a heat seal tacking for easy positioning. Semi-Stitch is available in 2 or 3 colour combinations and are available in all Pro Twill colours offered by Discovery. Basically, any product offered in Pro Stitch is available as Semi Stitch.