Robust Metal Construction With Added Protection: This adjustable dumbbell weight set is built from heavy-duty steel plates for exceptional strength and durability. Additionally, the protective polypropylene covers offer increased water and wear resistance, prolonging the longevity and reliability of the workout equipment. 1-sec Adjustment For Efficient Workout: Experience swift and seamless weight adjustments during your workouts with this fast-adjust dumbbell set. With just a quick grip, twist, and lift of the selectorized anti-slip handle, you can easily switch the 12 weight settings for each dumbbell in just one second. The hassle-free customization is aided by clear dials that ensure easy readability.