Versatile – dumbbells offer the ability to target specific muscle groups or attain a full body workout; build body mass, burn calories faster, increase endurance and strength, and benefit from a healthier body by using a dumbbell in your fitness routine. functional – perfect for isolations, full body, functional training, strength training and hiit workouts. features – the original hex shaped ends prevent rolling. the comfortable, upgraded medium depth knurling on the handle provides essential grip and security during use. coating is durable and effective.