ERGONOMIC HANDLES - Most studio dumbbells range distribute the weight evenly causing the handle to increase in diameter as the weight increases. The Power Systems Cardio Dumbbell adds the weight in the ends while keeping a consistent and comfortable grip location regardless of the weight. Each handle also features a slightly textured surface that serves as a gentle knurling to assist with user grip during studio sweat sessions. URETHANE = MAX DURABILITY - Dumbbells are some of most popular training accessories for studio strength training. Material coated studio dumbbells are recommended for use in studios because unlike traditional rubber coated dumbbells the vinyl or neoprene coating will not scuff hardwood floors. However, vinyl or neoprene coating will show wear and tear with scuff marks or small tears in the outer coating over time. This is caused by high volume use and/or overcrowded, inappropriate storage. SOLD IN PAIRS