What is a sales letter? A sales letter is a form of direct marketing that's designed to attract potential customers to your product or service.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. For each example, I'm going to deconstruct exactly what made it so effective, then tell you how to apply it in your funnel. The 12-step sales letter template is designed to overcome each of these objections in a careful, methodical series of copywriting tactics. I'll show you 5 well-written and proven sample letters that will help you to approach the retail stores to sell your product in different stores. Sales letters help you showcase your brand alongside a new product or service. Their goal is to persuade someone to buy what you're selling. The free sample letters provided here can be easily customized for situations where it may be appropriate to send a sales letter. A sales letter is a piece of direct mail which is designed to persuade the reader to purchase a particular product or service in the absence of a salesman.