This is for two cups that are flexible so that can be used to fit around various parts of the body.
The silicon cup/ funnel set comes with a built in ozone destruct so you dont inadvertently breathe any off gassing of ozone when you use the cup according to ozone therapy cup/ funnel protocol.
Silicon is ozone resistant and easy to clean. The flexibility of silicon makes it much more effective to use as it can be squished to shape and moulded into the shape of the body to create a good seal. This does a much better job than glass which is also fragile
The cup set comes in 2 sizes and also include standard Luer Lock connetions for easy attachment to ozone tubing.