Feature: 13-Layer Filtration for Ensuring Clean Oxygen Layer 1: Filters impurities and large dust particles from the air. Layer 2: Filters tiny dust particles in the air. Layer 3: Filters gas odors from the air.Product Highlights: Eco-Friendly Filter Core Paper: Made of high-density fireproof fiber filter paper, which is non-flammable and free of pungent odors. Essential Accessory for Oxygen Generators: Effectively extends the machines service life. Lightweight and Portable: Easy to install on the machine. Compatibility: Fits multiple brands and models for easy use and convenience.Specification: Condition: 100% Brand New Item Type: Oxygen Generator Filter Compatible Brands: Philips 3L, Omron, O2BOX, Haier, Skyworth, etc. Applicable Models: K3B, K3B-PH Size: Approx. 11.3 x 5.2cm / 4.4 x 2inPackage List: 1 x Oxygen Generator Filter