This set includes 3 Medium sized plates
Gray Plate: These paper and plastic neutral gray cards have a number of quality and longevity issues. Roy Larimer (Visionary Digital) has developed powder-coated aluminum plates that are 11% pantone neutral gray. They have an ultra-smooth texture with no relief, as opposed paper cards, They come in three sizes (See Below, dimensions may vary up to 1-2mm on a side). You can use both sides of the plate, on the smaller plates Roy has put on a pad that can be easily removed with a heat gun. They will last forever if properly cared for, they are UV sensitive and should not be exposed to direct sunlight. They are most easily cleaned with ethanol.
Medium – 10 cm x 10 cm (~4 in X 4 in)