I've edited this review as I'm now absolutely furious at having had two inner tubes on two consecutive rides destroyed by these stupid things.
Got a flat while out, which dismayed me no end as I bought these to stop exactly that from happening. Managed to get home and investigated the inner tube. This thing had been wearing away at the inner tube while on the ride, this much was obvious as you could see a clear line where the tape had been wearing away into the tube. This caused a series of small holes along wear the edge had been rubbing.
Changed the inner tune and stupidly put the tape back in thinking this may have been a one-off, but exactly the same thing happened on my next ride.
This is literally the most abysmal product I have ever purchased, EVER. What is the point of buying something that causes the problem it is supposed to cure?
AVOID AVOID AVOID - DO NOT BUY THESE, YOU WILL LITERALLY BE WASTING YOUR MONEY.