The US NAVY is now using this frame design! The Project is manufacturing durable injection molded DIY Face Mask Frames for individuals, families, companies (essential workers) and communities. This 6-pack features two of each size: Large for the average male adult, Medium for the average female adult, and Small for children. Just add your own filter media (numerous options) to quickly build an improvised face mask. This is the easiest way to make a reusable mask! These can be used over sewn masks to improve fit and function around the chin and nose. We are paying the shipping costs for Indiana customers.