I've used all the pneumatic pickaxes in Niu Niu's cool series, which can be said to be totally rubbish, unless you go for the design. The material he chose is very poor. Can you imagine that a pick with a thickness of 1.2 will crack along the die when it is used? Even with a very cheap domestic Alice, I have never encountered such a situation! This shows that the plastic they choose is very brittle, and the plastic material used to make the pick is either elastic (nylon material) or extremely hard (hard plastic material). He doesn't know how to calculate it in Niu Niu, and he sells it for 3 yuan, which is not worth it. Other types have never been used. It is said that the signature of the last descendant, Chen Lei, is ok, but it is not surprising and barely qualified. In short, if you have money, you can buy Deng Lupu, but if you have no money, you can fuck Alice. Niuniu is really not recommended.