LITE-VERSION - FOCUS ON PRACTICABILITY: Compared to mirror-finish version, the standard version skip the 1-hour-hand-polishing process in order to reduce the costs. But dont worry about the quality, because other production processes are exactly the same as with the mirror finishing version dumbbells. Since there are textures made by machines on each weight plate, they cant reflect things as clearly as with mirror finishing version dumbbells, however, they are still shiny and look great. IMPROVE EXERCISE EFFECT: This dumbbell is made of steel, small in size, and easy to grasp. Traditional dumbbells are bulky and limiting in terms of training movements as they often bump into the body during exercise. Using this dumbbell the movements can be more precise, deepening the muscle stimulation and enhancing the training effect.