At WeCare, our goal is to provide you with the highest quality training equipment so you can focus on your training. Rubber-coated dumbbells are designed for indoor use, so we recommend keeping them out of direct sunlight. The rubber coating is safe, flexible, stretchy, and waterproof. When new they can smell of rubber and may have some residue, but that will go away after a few uses or when wiped down with soapy water. With minimal storage space required, these dumbbells are perfect for training at your home, office, or gym. The hexagonal design ensures our dumbbells will stay where you place them, reducing the risk of accidents or damage to the floor. Free weight workouts improve strength and stamina while helping you burn fat and tone your body.