Size Measurement: ,compatible with most dust, easy to insert or replace the original one.The size is suitable for most children's style masks on the market.

Activated Carbon Filters: 100% brand new and high quality.NOTE:Delivery and arrive within 5-15business days. Size Measurement: ,compatible with most dust, easy to insert or replace the original one.The size is suitable for most children's style masks on the market. Safety protection: Ideal to protect your mouth and face from Dust, Haze,Allergies,Pollution, Ash, Pollen, Gardening, Crafts, PM2.5, Vehicle Exhaust, Woodwork, Pollen Allergies, and Fumes. Easy to use: just put it in the PM2.5 filter opening. 1. Filter insert can not be cleaned and should be replaced every week. 2. When film or sticky sediment stains emerge, please replace the filter. High-quality materials: Made of activated carbon and non-woven melt-blown filter cloth, 5 layers filter system effectively keep away from PM2.5 and a range of airborne contaminants.