Since this is not in response to a request for quotation, it must address a specific need of the reader's and offer a solution.
1234, Main Street
Boston, MA 02123
09 April, 2005
<Recipient Address Goes Here>
One if the biggest issues confronting <description of reader> is <nature of problem>.
I would like to offer you a solution. <Solution.>
In order to fully understand the benefits of <product or service>, I would like to give you a no-obligation evaluation and discuss the results with you. I can be reached at <phone number>. You have nothing to lose. I look forward to speaking with you soon.
encl: <List of enclosed items goes here>