This 25-piece lava rock set is designed for decorative propane and gas fire pit, fireplace and stove setups. The pieces are listed in the 1.2 to 2.0 in size range, with item dimensions of 2 x 1.77 x 1.77 in. The listed material is ceramic fiber, and the appearance type is imitation coal block. The set is listed for indoor and outdoor use in fireplaces, stoves, courtyards and camping settings. Net weight is 1.1 lb, and the color is black.