Layer by layer cleaning filtration, can filter fine particles, convenient for use. An essential accessory for the oxygen generator, which effectively extends the life of the machine. and small, easy to carry and install on the machine. Adopts standard filter paper, high density, no pungent smell. Made of high quality ABS material, safe and environmentally friendly, stable and durable. Specification: Condition: Elements type: filter. Filter Screen Type: Composite Filter Screen Working technology: HEPA technology. Applicable scene: ventilation accessories. Colour:As shown Material:ABS Size:16 x 10 x 8cm Package Contents: 4 x Replacement Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.