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All the big supermarkets have, and now Taobao is also a lot of home, the quality is different, when the purchase of more evaluation.
To buy stainless steel, you want to buy expensive, low price is generally very thin, the worst material.
There is no difference in the material model of the aluminum alloy, but the price will be much worse than the thickness.
There is not much difference between iron pipe spray, electroplating and plastic coating. The price is relatively moderate, there is not much difference in counterfeiting, but the difference is above the pipe diameter. It is commonly used for 22/25 pipe, and the price is lower than that of 13/16 pipe and 16/19 pipe.