there is a goop solution in the tire, when a hole is made the goop cloggs. So in a normal tire where the air would slowly escape in these as the air starts leaking the pressure pushes the goop into the hole and seals the leak. this will not work though with major gouges like a knife slash.
I hope that helps because i cannot be any more descriptive than this, if you need a better description go to continental tires web site they make the tires for the 300.
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