5 layer PM2.5 Activated Carbon Filter 10 Pack * Composed of non-woven fabric, activated carbon and advanced filter cotton * Five-layer protection to isolate from dust, odour, gas, smoke, pollution, ash, pollen with good ventilation * Includes an activated carbon layer and non-woven melt-blown filter cloth, the (5) five-layer system effectively keeps you away from a range of airborne contaminants * Activated Carbon Replaceable Filters size: 12x 8 cm/ 4.7 x 3.1 inches * Fits slip through pockets on masks DISPATCH - 1 to 2 business days if bought alone - 3 to 5 business days if bought with a mask - Only USA and UK Shipping goes out with TRACKING, Rest goes out with Standard NON-TRACKED Post. LAYERS - Carbon Filter Layer 1 - Anti Sticky Cloth - Carbon Filter Layer 2 - Filter Cloth - Carbon Filter Layer 3 - Activated Carbon - Carbon Filter Layer 4 - Filter Cloth - Carbon Filter Layer 5 - Anti Sticky Cloth LEGAL DISCLAIMER Not intended to act as a medical device or other medical product, and should not be used as a replacement for conventional and approved personal protective equipment, including surgical masks or respirators. No warranties, either express or implied, are hereby given that the cover will prevent infection or the transmission of viruses or diseases. The cover is not a substitute for professional medical advice, diagnosis or treatment. If you have any specific questions about any medical matter, you should always consult a doctor or other healthcare provider. *** Please note that the filters can not be washed, we recommend that you choose the time of use according to your living environment and change it at least 1 to 2 times a week to maintain health. *** Please also note that the filters are NOT PRINTABLE and just serves as a refill pack for Face Coverings with filter pockets