1. This CPAP Filters are only with compatible with the Air Mini CPAP machine Suitable for travel. 2. Filters keep the air you breathe in with your CPAP devices clean and healthy to get the best results from your therapy. 3. It is recommended to replace the CPAP filter at least 2 weeks for best results. Name:CPAP Filter Type: Ventilator filter cotton Work Mode: CPAP Model Number: KXAM Item Type: Sleep & Snoring Category: air mini cpap accessories Colour: white Material: cotton Size: about 3 x 3cm Package Contents: 20 x filter pads 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.