Puncture proof inner tube United States Patent 6418991 Abstract: An improved pneumatic tube formed from a semi-rigid, air-tight rubber core encased by a plurality of thin, armoring Kevlar layers bonded to the exterior wall of the core. The composition can be used as inner tubing for cars, bikes, motorcycles, planes, and any kind of vehicle having a pneumatic inner tube. It can also be formed into a puncture proof rubber raft can anyone get anything like these?