A wonderfully helpful tool for use in quilting and sewing projects. The color filter helps you select the right colors for a project by determining which materials stand out the most. Simply hold the filter in front of your fabric and view the fabric through the filter. Color Evaluator II, includes 2 color filters. Helps select the right colors for a project, determine LIGHT or DARKNESS (value) of materials. The red filter is used with warm colors and the green filter is used with cool colors. Filters are about 5 1/2" x 1 1/4" x 1/8".