These are the brand new aftermarket street pro tyres from rocker bmx these can take more pressure we advise no more than 60 psi as your wheels could be damagedthese roll super fast and smooth and they hold their shape better than the standard tyres fitted to most mini bmxs no more wobbles and they look pretty sick too a must have if you are serious about riding skateparks streetsize 4135 4price is for 2 tyres and 2 inner tubes