Identification of Goods And/Or Services
A written statement of the goods and/or services included in an application. Every application must include an identification of goods and/or services. If you fail to list any recognizable goods or services, the USPTO will return the application and refund the fee. When specifying the goods and/or services, applicants should use clear, concise terms, i.e., common commercial names and language that the general public easily understands.
Please note that the terms in the class headings or short titles of the classes in the "International Classification of Classes of Goods and Services" are generally too broad and should not be used alone as an identification. Also, an international class number alone is never an acceptable listing. For a listing of acceptable wording for goods and services.
-- see Trademark Acceptable Identification of Goods and Services Manual.
Source: U.S. Patent and Trademark Office.