This building set is made of TPE plastic blocks that have a nice texture. It allows children to experiment building ancient structures with columns, arches and domes. Players either follows the steps shown in the booklets to build pyramids, arches, domes or structures with columns, or they combine the pieces differently to make their own structures, where the blocks are simply superimposed. Quite a challenge?! Includes 422 pieces. Comes in a plastic bin with lid.