This is a one filter pack.
What's Included: 1 - Philips Respironics REMstar Choice Disposable Filter (Model # CF-362522-1) Related Products: REMStar Pro/REMStar Plus Non-Disposable Filter by Spirit Medical Philips Respironics REMstar Pollen Filter Power Cord for Respironics Machines Philips Respironics Shielded DC Cord for PR 60 Series Systems | Philips Respironics REMstar Choice Disposable CPAP Filter | White Philips Respironics REMstar Choice Disposable CPAP Filter | White Philips Respironics REMstar Choice Disposable CPAP Filter OverviewThis replacement disposable filter is used in REMstar, REMstar Choice, and REMstar Choice-LS machines..