For each example, I'm going to deconstruct exactly what made it so effective, then tell you how to apply it in your funnel. In this article, we provide a stepbystep guide to help you write an effective letter to sell a product with a template, sample and tips.This sales letter introduces a new beauty product called "Fair and Beauty Lotion" to Gracemel Kim, general manager of PPKK Beauty Clinic. A sales letter is an important tool for shaping the way customers think of you. The way to do that is in a carefully crafted, beautifully structured, expertly designed sales letter. Here is how you do it. Sales Letter Example: Email. Need help drafting an email sales letter? Is your sales letter a killer? Or is it killing your business?