It's now in my bungee bin. History.

I probably won't have to deal with a flat for a long, long time now, as I am very lucky with tires. However, I'm obsessed with that little gadget in the Rema video that you hold over the punctured tube and the styrofoam balls start to bounce around as soon as they hit the leak. I'd like to make one, as it seems you can't buy them in the US. Does anybody know what it's called, and am I wrong that it isn't available in the States?