The MBS T1 Tyre is a extremely lightweight tyre especially when mounted on the Twistar or Rockstar Pro Hubs. These are a specially designed tyre for ATB and mountainboard use and as such are a soft compound with thin walls to maximise the weight saving. They offer amazing grip and accelerate amazingly. The T1 tyres are a bit quicker on hard tracks than the T3 but will slide a bit easier too if you want to drift or slide on a kiteboard.
It is hard to put into words what the difference these tyres make to racing and freestyle performance but it is just amazing!
These are sold as a set of EACH without Tubes.