Trade key can be a good source to find manufacturers, but please be aware that these manufacturer/suppliers pay a lot of money to be a part of their website, so the website organizers are looking after them, not necessarily the buyers.
If you are not sure about a supplier we suggest you do a sample order first buy one or two of your product before you do a bulk purchase, if your supplier does not allow this they are obviously hiding something from you.
For reference as to what other members think of Trade Key, you may go to:
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Tradekey is not a SaleHoo supplier, we can't guarantee their suppliers service or products. We recommend you download the 'How to Find Fantastic Suppliers' bonus PDF to learn how to check if a supplier is legitimate.