they may also have the bell tube that is flat proof. they also work well. i believe the tubes already have slime in them which i have used and it works great to keep from getting flats
I thnk those are good tubes too, the tire size range indicates use in a few sizes of tire. When I built my bike I decided to change the tires, so I got some bell tires with KEVLAR, and some bell tubes. The tires had a range of sizes that they are replacement for. The kevlar is supposed to resist puncture so far so good..