Color Evaluator II &ndash; Red & Green Viewing Filter Set &ndash; Color value finder/gray scale contrast evaluator. Get the right color mix for your project! (Red Green) Red and Green viewing filters help you select the right colors for your project Filters are made in the USA of thick acrylic and measure 1.375 x 5.25 and come in a reusable storage container View your materials through these transparent filters to determine the lightness and darkness (value) of your materials Great for quilting, oil & watercolor painting, graphic design, mixed media art, sewing, rug hooking, plein air painting ** SPECIAL ** Get 5% off when you buy 2 or more Cottage Mills products