The Kyosho Redbox Front 1/8 Foam Rubber Tires in 37 Shore with 0 offset come in a package a package of 2 and are pre-glued the the wheels.

These are Sspecial foam tires made from Japanese rubber for maximum grip on asphalt surfaces. This rubber is especially suitable for surfaces that are subject to a low level of grip. In contrast to the foam tires from other manufacturers, the wear of the rubber from the Japanese rubber from Kyosho is much lower, so the overall result is an excellent price-performance ratio!

The tires are already glued to the rims. The white KYOSHO-spoke wheel is characterized by very high strength and very high torsional rigidity. So the wheels are also harder and stronger than your opponents and less likely to fail in an accident. Furthermore, this rigidity and strength in the wheel provides more precise handling, which gives the driver a higher level of control.

On-road tires can be rated by the hardness of the rubber (or foam). Kyosho measures the shore rating by using a tire durometer. This is a  tool that has a small steel pin that is spring loaded and indexed to a circular gauge, similar to a tire pressure gauge. To measure the tire hardness you roll the durometer on top of the tire; the compression force that the rubber has exerted on the steel pin can be read on the dial. Repeat it over several locations on the tire and the average is the tire's shore value. The higher the shore rating of a tire, the harder the tire. A softer tire will give you more traction; choose wisely as you may sacrifice the durability and longevity of the tire. In a long main this could be an important factor.  

Also, the higher the temperature of the track surface, the harder tire compound should be chosen in order to avoid overheating of the tread. If there is an overheating of the tire begins to slide on the surface.