The A2A Spacer Is Designer To Help Deliver Medication From A Pressured Metered Does Inhaler In The Lungs By Improving Co-Ordination And Medication Deposition. Made From Anti-Microbial, Low Static, Transparent Plastic For Improved Hygiene For Single Patient Use. When Open The A2A Has A Volume Of 210Ml, When Closed It Is Highly Portable. Features: Collapsible Pocket Sized. Easy To Clean. Accepts Most Pmdis Available. Comes With A Small Sized Mask.