When it comes to designing a strong tube, you have other factors like making it affordable. This is what Fly Bikes ran into on the new Cobra inter tubes. Taking 5 years to release, the Fly Bikes Cobra Tubes will start hitting retailers in the next couple of weeks. Not like most tubes, the Cobra is not circle but straight with flawless seams and you will not have to remove the tire to replace in case you get a flat. An instructional video will release soon, showing the world how easy it is to use the Cobra Tubes.