High-performance FSC-F surgical mask for virus prevention, a set of 4 boxes containing 3 adult-sized masks each. [Product Features] - High-performance 3-layer structure - Proven data developed for virus prevention - Repeat 10 times usable - 99.9% blockage (VFE test results for viral filtration efficiency, US military standard test) - 99.7% blockage (PFE test results for particle filtration efficiency using latex particles, US FDA standard test) - New high-performance charged filter increased [Product Condition] Unused (box has peeling) [Contents] 3 masks x 4 boxes [Size] Adult The boxes will be flattened and shipped. Thank you.