The original ergonomic hexagonal dumbbell.Hampton was the first company in the fitness industry to add an ergonomic-style grip to traditional hexagonal dumbbells. Because Hampton manufactures these in their own factories, you’re guaranteed consistent size, shape, and coloring. Hex dumbbells are made with a solid steel handles up to 100 lbs. They are turned down from 35 mm stock, unlike that of the competition, who casts theirs at 25 mm. Competitors' hex dumbbells are made entirely of cast iron, which increases the chance of the head breaking away from the handle. With its baked enamel finish, Hampton's Pro Hex has the toughest and most durable exterior coating in our industry.y.