Usage Tips:[PRODUCT SPECIFICATIONS ]: This high-efficiency Core 300 Air filter replacement capture 99.97% of airborne particles and odors, great for households with pets, cooking and smokers. With cost-effective price to save much cost for your all year round air cleaning need. It is recommended to replace filters for every 6-8 months. [REPLACEMENT PART No.]: Core 300 Air Filters compatible for Core 300 air purifier and Core P350 air purifier, part number Core 300-RF & Core P350-RF.It is recommended to replace filters for every 6-8 months. [QUALITY]: Air Purifier replacement filters improve your air quality & neutralize odors for a clean & healthy breathing experience year round with replacement filters for air cleaners & purifiers.For best performance use only Replacement filters. Each air purifier's performance is tested as a system with the filters for best efficiency. Colour:white Material:plastic Size:193 x 150mm Package Contents: 1 x air purifiers filter 1 x brush Only the above package content, other products are not included. Note: Light 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.