Frame markings are typically made up of two ratings, one of which is the Style and Protection Rating. This particular range includes face shields with frames that have been rated 9 (Resistant to Penetration of Hot Solids), making them suitable for a range of applications that involve dealing with hot debris and flying particles. If you have any questions or need a product recommendation, do not hesitate to contact our customer support team on 020 7501 0594 or via our Contact Us page.