HQ Groovy Boards create a precise pattern that can be used by all quilters, from beginning to expert. Made of durable plastic, these patterns can be used over and over with the same precise results. Handi Quilter recommends customers purchase a minimum of two of the desired pattern to eliminate having to stop and mark your quilt project. Using Groovy Boards requires a stylus and adapter. HQ Pro-Stitcher users will require an additional adapter. Use center dot for placement on quilt.