The Master Trainer is the essential tool for the Tracing exercises in Free-Motion Mastery in a Month.
Buy the Small size if you will be quilting on a smaller domestic sewing machine. For larger domestic machines and all longarms order the Large size.
In addition to its function as a muscle memory training tool, the Master Trainer also can be used as a quilting ruler. The straight edge does straight lines, the rounded side does small curved grids and block outlines, the wavy side does S-curves and the bumpy bottom edge does clamshells. Instructions for each are part of the daily lessons in the book and the video class.
NOTE: The trainer is clear plastic -- it has been photographed on a black background in order to show the lines.