This is a replacement filter for the Levoit Core 300, featuring a True HEPA filter that captures 99.97% of fine particles. - Model Name: Core 300-RF-JP - Filter Type: True HEPA 4-layer premium filter - Compatible Models: Levoit Core 300 - Function: Captures 99.97% of fine particles - Size: Standard size I accidentally purchased this and am now selling it. It is new and unused, please check the condition in the photos.