4 mm. inner tube
 

Hi ;

Dual Star has them on their web page and i think it will turn my tires into "almost" puncture proof.

So the question is : did anyone use them or has an opinion about it?

thanks.

Well worth getting. My 4mm front has never had a problem in 25k miles, but there's been six punctures at the back since the heavy-duty tube got replaced (valve-stem ripped out when rear-ended in Costa Rica.)

James