This is a set of two HPI 2.2" Classic King Wheels. HPI's Classic King wheels are a stylish way to add a bit of bling to your Wheely King, Nitro MT 2 or Firestorm! Made from high impact nylon for durability, the Classic King wheels are tough, light, strong, and fit 12mm hex hubs that are popular on many cars and trucks. The 2.2 inch diameter allows you to chose from a huge assortment of tires.