Sales letter is an important tool if you want to sell any service or product. If you have excellent product but a bad sales letter, you won't do any sale. So how do you create a high-conversion sales letter? We could say that anything above 1% conversion is good. Here's how you can have sales high-conversion:

• Have a super product. It's very simple. Without having great product, how can you sell something. One thing which a great product have is it brings solution to people and is easy to use.
• In your sales letter you have to show them a problem, and how your product/service will help them.
• Provides testimonials which shows your product/service in providing solution.