Product Name : filter element Product weight: about 30g for the front, about 25g for the back. Delivery list: 2 filters. Applicable models: Tienco A10/A11 Hero/Master post-filter Main function: filter fine dust DEEP CLEANING PERFORMANCE HEPA filter can capture 99.97% of particles, dust and allergens as small as 0.3 microns to remove house dust, pet dander, mold spores and pollen. Ideal for allergy sufferers and pet owners. QUALITYandEacute; SUPERIOR The pre-filter is essential to the suction power and to suction power. Please replace the pre-filter every 6 months for optimal cleaning performance. WASHABLE AND REUSABLE The HEPA filter can be washed clean to under running water and must be completely dry before reinstalling.