new design,adjustable dumbbell,dumbbell,sports equipment 55lb adjustable dumbbell5-55 lbs with 2.5 lb increments Contour Comfort Handles Smaller in diameter than similar adjustable dumbbells Slide and Lock System for Quick, Easy Adjustments Lifetime Warranty on Weight Plates; 5-year warranty on Handle new design,adjustable dumbbell,dumbbell,sports equipment