Dear Mr. /Mrs. /Ms. Spencer:
As you have our loyal customer for so long now, it is our pride to present to you our new product and propose that you kindly give it a try.
Our company has developed a new line of products which are actually a modification of our old products. This modification has been made as the company continue to exert effort in coming up with new and improved products for your optimum satisfaction and benefit.
We would like to suggest that you try bringing these products out the way you have been doing with our old products.
Attached is the product brochures and information for your reference.
We are hoping to hear from you soon with comment, suggestions and evaluation of our new products. We value your opinion highly and will always consider what your feel and what you say.
Thank you very much for patronizing our company all these years.