Dumbbells are used to build muscle, correct imbalances, increase endurance, and improve functional movement.
Construction: They typically consist of a bar with weights on each end and are held in the hand during exercises.
Types: There are various styles, including fixed dumbbells, adjustable dumbbells, and hex dumbbells (like the one pictured, with a flat-sided head to prevent rolling).
Material: The dumbbell in the image appears to have a rubber coating, which provides durability, protects the dumbbell itself, and helps prevent damage to flooring.