The PowerBlock Pro Series EXP Stage 1 dumbbells allow for easy weight adjustments from 5 lbs to 50 lbs per dumbbell, with 2.5 lbs micro-adjustments thanks to the Auto-Lock system. They're made of steel and hard urethane for durability and quiet performance. The contoured, rubberized handle improves ergonomics, while the open design increases range of motion. Each dumbbell features color-coded bands for easy weight identification. They're ideal for demanding users looking for versatility in a single piece of equipment.