假定你是spring有限公司销售经理李华,给客户mr.wang写一份信.日期.09.3.18.材料价格上涨.产品价值上调

Dear Mr.Wang,
With the increasing price of material, we would like to increase the price of our products properly.
However the ordered products to be remained to same price as we agreed, your understanding and cooperation will be highy appreciated.
Regards,
Li Hua
Spring company
Mar.18 2009