This is a lot of 2 LEGO 6x12 flat base plates, model number 3028, in green color. The plates are stackable and made of plastic. They belong to the LEGO Building subtheme and are part of the Bricks Bricks Bricks set. The set includes 1 piece, which is a 6x12 plate. These plates can be used as platforms for building LEGO structures.