The packaged rubber has a slightly heavy smell, and it will take some time to disperse the smell. And the volume is relatively large, but generally speaking, it has no effect on doing movements, because most gyms are packaged. And there is a rubber layer outside, which will not damage the floor and will not make too much noise to disturb others.

The soaked plastic is easy to rust inside, and the pressure is small when it bumps with small weight, and the probability of rubber damage is small. The weight is different.

Electroplating and baking paint are similar, small in size and not easy to rust. Even if the bump is rusted, it will be limited to that place, and it will not be completely rusted, but it will easily damage the floor if you are not careful.

In terms of material, rubber dumbbells are safer than electroplated dumbbells and will not rust. If you practice at home, I suggest you use a combination dumbbell with plastic coating, which is also more economical, because the price of electroplating is 2-3 times that of plastic coating. Pay a little attention when you use it yourself, and the life of the packaged dumbbell is also very long.

As for recommending online stores, there are many on Taobao, so I won't advertise for others. Look at the sales volume and evaluation when choosing a store. Generally speaking, there will be no big problem.