Yes. They appear to made of solid rubber. They are black and stretchy, and impervious to screwdrivers.
I had never heard of them either, until I went to check the tire pressure, and discovered, "Whoa! No valves!"
My friend tells me they are bad because being solid, all the shock absorption of a regular tube is lost, and all shock is transmitted to the spokes, rims, and headset, all of which will eventually be ruined.