请外贸英语高手帮忙翻译下，谢谢（汉译英）

We gaurantee our product is of top quality, but we are not certian if it works well with yours. Please let us have your factory address in Shenzhen and we will send you our product sample. May we look forward to our successful co-operation.

The price for this quality is _______.
This is a FOB Shanzhen factory price.

(NOTE: The is no such quailty as 90% or 90 points in English. If you must translate word for word, then you could put in class A quality since 'A' normally refers to any marks equal to or above 90%.)

We are sure to make the product 90%,but we dont know if it applies for your products.please tell us your factory address in shenzhen,we'll mail the sample to you.wish to cooperate successfully!
the cost for 90% is
it is the cost to the shenzhen factory