[Full Compatibility] for Core 300, Core 300s and Core P350 Air Purifier, part# Core 300-RF, Core 300-RF-TX, Core 300-RF-PA. [3-IN-1 FILTRATION] Our Core 300 pet care replacement filter features 3-Stage Filtration System: ①Fine Nylon Preliminary Filter ②H13 Grade True HEPA Filter ③Activated Carbon Filter. It's specifically customized for pet dander and odor, lint, etc. [Breath ] Combines with an upgraded prefilter, the activated carbon filter effectively captures at least 99.99% of 0.01-Micrometres [Effortless Setup] Just take the old filter out, and fit the new one in. Colour:Yellow Material:composite material Package Contents: 2 * air purifier 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.