This is a set of 4 Mah Jong trays from the 70's in bright primary shades of yellow, red, blue and green. I know, green isn't a primary color. These have been used and show some signs of wear along the edges. The ends have brass hardware with rubber tipped prongs. I don't know anything about Mah Jong, so i can say no more. They measure 18 1/2'' x 2 1/4''.