Comprised of a light-weight white vinyl kit (10in. x 12in.x 1 3/4in.) containing eight color disks, numbered in 10% increments ranging from "Very Light" (tile #95) to "Very Dark" (tile #25). The kit also includes 2 black background sheets, two standard petri dishes for sample preparation, and an easy to read manual written by Carl Staub. These eight industry standard disks are designed to enhance consistency and assure that both roasters and their customers are in agreement regarding degree of roast.