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This resolution ring of smart key is made mainly by innocuous rubber material , which contains fluorescent powder. It has concise and decent model and light color.The users can classify the key's function by different shapes. The key with the same function can be divided by different colors.
For the reason that it's material is innocuous rubber,it has a strong performance of extension and durability. It's available for old or child. The fluorescent powder can provide convenience for night use. Also it can avoid the noise produced by traditional key's collision.
The same key's group is connected by a simple circle. So it is easy to roll it.