The Volcano Solid Valve Wear & Tear Set is comprised of all the necessary spare parts for using the Volcano Solid Valve by Storz & Bickel. Specifically, the Volcano Wear & Tear Set features a balloon tube set, Solid Valve O-Ring set, Solid Valve Normal Screen set, and a cleaning brush. All Volcano parts found in the Volcano Solid Valve Wear & Set are solid and dependable. Boasting solid German engineering, the Volcano Solid Valve Wear & Tear Set gives you all you need to use the Solid Valve with your Volcano vaporizer.