Other than these Hard and soft compound tires,they use entirely different type for qualifying session,where the tire would last for only 1 or 2 laps when ridden hard,but the amount of grip would be much higher than even soft compounds.this lets the rider push it to the limit for that one or two qualifying lap with minimum lap time.they also use dual compound types,or they choose a tire according to the track,ie in a track with more right hand turns,they choose a more sticky compound in the right part..the choices are endless,,