This is a letter you have to get right. The presentation and the quality of information are either instant selling points or instant turnoffs.
The information you provide should be considered as binding quotes of rates and prices for legal and business purposes.
It's a reasonable assumption on the part of your client that you are offering services and goods on those terms. Clarity is very important, and customers can easily get annoyed by any variation of the terms you quote in your business advertising or correspondence.
Whatever you send a new customer must look good, and contain meaningful materials, with enough information to encourage contact and real interest in purchases.
The letter itself should be simple, and preferably brief, not a distraction from your sales materials.
We're looking for top of the line trade customers.
We're a new business / We've been in the business for (number of years)
We're highly competitively priced, and we have a very wide range of (insert definition of product or service) to offer.
Please find attached / enclosed:
We hope you like what you see. Please call me / our sales team / manager, on the above contact number, so we can talk business.