Early last week, we sent a sample of our (Name of product) to you. We have not heard from you and we are wondering how you liked our product.
Please take a moment to let us know your feelings about our product. Do you feel it needs to be improved or changed in any way? Is it excellent in its current form?
I have enclosed a stamped response card for your convenience. Your response will let us know if further information is needed by you or if you are simply not interested at this time.