HEX SHAPED HEAD - Hexagonal shaped dumbbell heads to prevent it from rolling. The dumbbells can be stacked together for space saving storage. VARIOUS SIZE OPTIONS – Marcy Hex Dumbbell comes in different sizes that both beginner and expert can find ones that are suitable for the workout needs. Available sizes: 3, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, and 100 pounds. SOLD INDIVIDUALLY. FULL BODY WORKOUT – Exercise with Marcy Hex Dumbbells to target a large group of muscles, increase range of motion, balance, and stability with different workouts.