About this item * The 12", and 14" sizes come with Ball Bottoms, the 16", and 18" chairs come with self leveling glides. * BUILT FOR COMMERCIAL SPACES - Our chairs are crafted from professional grade materials and are perfect for use in classrooms, offices, daycares, medical facilities, and home school. The chairs conform to BIFMA standards. * STACKABLE - The chairs can be stacked up to six high, and feature a convenient carrying handle for effortless mobility. * RIVETED BASE - The shell of the chair is riveted to the base, making it ideal for all environments. * FULLY ASEMBLED - The chairs are delivered fully assembled, and are ready to use.