Rubber or urethane dumbbells are safer than steel, iron, or concrete dumbbells. They both absorb shock better. On the other hand, rubber has an odor and degrades sweat and sunlight. Dumbbells in hexagonal shapes help avoid rolling. Before buying a set, you should examine the environment and the weights you need. Eser Marketing International Dumbbells in Sri Lanka is a terrific fitness option. Iron, chromium, rubber, hexagonal, bone, and weight plates.