The OptiChamber Diamond valved holding chamber (VHC) is smaller than most conventional VHC's and incorporates a stepped mouthpiece, a clear, anti-static chamber, and a low resistance expiratory valve that helps measure breath count and breath hold. For use with inhaled steroids, as well as long-acting and rescue pressurized metered dose inhaler (pMDI) medications, OptiChamber Diamond's intuitive design enhances medication delivery and compliance for patients of all ages, at home or in the hospital. Chamber: Anti-static Acrylonitrile Butadiene Styrene. Length: 5.6" Life span data: Replace after one year. Maintenance: Can be easily disassembled for hand cleaning with warm water and liquid detergent.