Collins Sneak Peek Preview sets allow you to view fabric through a window template. Use it to mark seam allowances and cutting lines, or stitching lines for hand piecing. The Red surface filters out color in order to check light, medium and dark values for contrast in a quilt design. Convenient size for classes and fabric shopping. Hangs from a metal beaded loop for easy flipping! 5 Geometric Shapes- Squares in two sizes, triangles in two sizes, and a hexagon. 4"x 7"