The life maxx hexagon dumbbells are commercial dumbbells which will be excellent in any gym or strength facility the rubber hexagon style of them also makes them perfect for studio and home use these dumbbells are made from solid cast iron which gives them a sleek and compact feel the steel is the base material in these dumbbells with a 1cm of rubber coating on the ends key features of the life maxx hexagon dumbbells the dumbbells are coated in durable rubber ergonomically shaped hand grips