This is a set of four Kyosho High Grip Rear Tires, for use with the Kyosho Mini-Z MR LM Type chassis. These are the stock replacement tires that are included with the Mini-Z LM Type chassis. Choose from 20 and 30 Shore compounds (softest to hardest). 30 Shore is the standard compound included with Mini-Z MR LM kits, with 20 being an optional softer compound. 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..