I heard thre were category 4 for fireworks. Can I buy these? No, category 4 fireworks are reserved for professional display operators. By interact|2021-10-15T14:38:36+00:00October 15, 2021|Firework FAQ|0 Comments Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: interact Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment.