I'm writing to ask if you have received the supporting matersials we have sent to you last Friday. The supporting mateials contain the detailed information you need. And we are certain that these supporting materials will assist you to make a better choice on our cooperation.By the way, I would be great appreciated if you can tell me when you will check and discuss these supporting materials, and finally make your decision.Looking forward to your early reply.Yours sincerelyJohn Smith