Be sure to add me to your favorites list Castle Grade G-Series Silicone Reusable Respirator Mask, G9 Medium and Large Adult Size, Plus 1 New Filter installed included. This is a very good condition Castle Grade G-Series respirator mask. It is the G9 model, which is medium and large size for adults. It was used, but is in very good shape, and includes a brand new G series filter installed. It is my last one, but more can be found online. It has been thoroughly washed before the new filter was installed, but of course you can wash it again before using. Here is some further info on this mask: COMFORTABLE: No more endless readjusting, no more foggy glasses. The base of the mask is made from lightweight silicone that ergonomically forms to your face, creating a complete seal while still feeling soft against your skin. Our masks use a patent-pending design with self-suction that offers a seal superior to surgical or cloth masks while providing more comfort than traditional masks. CUSTOM FIT: The G-Series Mask comes in two sizes to fit everyone! Small (G8), and Medium - Large (G9). The Small mask measures 3.385 x 4.173 Inches, and the Medium - Large Mask is 3.937 x 4.330 Inches. 70% of adults prefer the Medium - Large (G9) Mask, find the fit that is right for you. Comes in a multicolored rainbow and solid blue. EASY TO CLEAN: The G-Series Masks are designed to be reusable every day and can be easily cleaned. The base of the mask can be sterilized just by wiping it down with 70% alcohol wipes. The masks are dishwasher-safe, and can be placed on the dry heat setting for a more comfortable fit (remove filter). It can also be cleaned by dipping in boiling water for 2-3 seconds. 4 PROTECTIVE LAYERS: Each Mask uses a replaceable 4 ply filter that has been tested to block micro-particles. Our filters are custom-fitted to the G-Series Masks and should be replaced after 32 hours of use or after one week ? whichever comes first. When applying the filter, the blue polypropylene layer should face the direction of your mouth. We offer charcoal-infused filters in packs of 5. NON-RETURNABLE: Due to sanitary concerns, our masks can not be returned. Please keep this in mind when purchasing. Material: Silicone The CastleGrade G-Series Masks are reusable respirator masks designed for everyday use. The base of the mask is made from a lightweight silicone that forms to your face, leaving a complete seal and minimal marks. The mask is paired with a replaceable 4-ply filter that can be used for up to 32 hours of breathing time or 1 week (whichever comes first). 4 layers of filtering materials? Filters micro-particles on both inhale and exhale Eco-friendly and reusable design Easily cleaned by wiping and is dishwasher-safe Strong silicone seal for superior protection Ergonomic design and soft fit Fits with glasses comfortably, no fog Each mask comes with 5 standard filters Sizing Note: 70% of adults prefer the G9 (Medium - Large) size Thanks for looking! Check out my Store!