1 Seconds Weights Change: One-handed operation design, convenient for fast changing dumbbells' weight during training. Turn the handle with one hand, adjust to desirable weights in 1 seconds.This makes it easy to quickly switch between different loads during your workout. And it improves the efficiency of training, avoiding the hassle of using multiple individual dumbbells. 10 in 1 Adjustable Dumbbell: adjust weight from 10 lbs to 55 lbs（10/15/20/25/30/35/40/45/50/55) , 55 lbs coloreful dumbbell suitable for professional and beginner, bring rich exercises feeling during training for both. Safe & Space Saving: With safe hook structure in Weight Plate. It could prevent from weight plate dropping during exercises. Meanwhile, in your limited workout place, It combines multiple weight blocks into one to be easily stored at home or gym. High Quality: Weight plates were made of Silicon Steal Sheet, was powder coated for anti-rust without any foul smell. Durable handle anti-slip texture, which would not rusty and provide more safety. A+ Service: comes in 2 BOXES. Free replacement or parts guarantee for any quality problem within 3 year, satisfaction guaranteed. 55lbs colorful pair dumbbell