30 PREMIUM CPAP FILTERS - Engineered to block the tiniest particles of dust, & pollen to keep YOU & your CPAP machine healthier with every of the freshest air! THE PERFECT FIT - Great news: for your peace of mind, the size of CPAP filters fully fits most CPAP machines, including all S9 series, AirSense AirCurve & AirStart series CPAP & BiPAPs. SUPER SAFE & EASY BREEZY TO USE - Each filter for CPAP goes beyond filtering harmful mini contaminants. MADE of high-quality materials, our Filters are extremely safe and Bisphenol-A free. You'll breathe easier than ever without running the risk of exposing your lungs to any type of allergies. No chemical smells either. Just beautifully designed filters that are extremely easy to change, replace or dispose of. EASY USE - Fits most machines, just replace filter every 3-4 weeks to a , healthy sleep. colour: white Material: cotton size: 5.3 x 3.5cm Package Contents: 1 set x 30 filter cotton 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.