Fangrui Product Details Environmental Material: The Filter Elements Paper Is Made Of Environmental Materials, And The Whole Is Made Of High-density Fireproof Fiber Filter Paper. It Is Non-flammable And Has No Irritating Odor. It Filters Impurities In Oxygen To Ensure Oxygen Quality Oxygen Concentrator Accessories: Our Filter Is The Filter Accessory For The Oxygen Concentrator, Which Can Effectively Extend The Service Life Of The Oxygen Concentrator Easy To Carry: Small And Light, More Convenient To Carry, Suitable For Workers Who Accessories Outdoors Wide Range Of Adaptation: Suitable For Of The Oxygen Generator Equipment On The Market, Easy To Use How To Use: Open The Back Cover, Remove The Old Filter, Insert The New Filter, And Then Close The Back Cover Colour:as Shown Material:plastic Package Contents: 2x Oxygen Generator Machine 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 Pictur