• 10 pack of PM 2.5 filters fits into the insert of both the adult and kids size BondStreet face masks
• Each PM 2.5 Filter is made of 5 layers of protection and blocks 65% of particles (nitrogen dioxide, dust and micro-particles)
• Effective for 3 days if worn full-time otherwise change after 5 days of use
*Final Sale. Due to the nature of this item, we cannot accept exchanges or returns.