This is a set of four Kyosho High Grip Front Tires, for use with the Kyosho Mini-Z MR LM Type chassis. Choose from 20, 30 and 40 Shore compounds (softest to hardest). 40 Shore is the standard compound included with Mini-Z MR LM kits, with 20 and 30 being optional softer compounds. Use different compounds to tune the level of traction for various track conditions; softer when you need more grip and harder when you want less grip.