COTTAGE MILLS-Colour Evaluator II: Red and Green filter.This tools helps you select the right colours for your project and determine the Light or Darkness (Value) of materials.The red filter is used for warm colours; the green filter is used for cool colours.This package contains one red and one green filter.Each is made of durable transparent plastic and measures 13cm x 3.2cm .Made in USA.Dimensions:.Height: 6.65.Width: 1.9.Depth: 0.75