HPI Pro Molded inner foam inserts for 24mm rubber tires helps increase grip and stability of tires. Prevents tires from caving in during high speed & cornering. Red and rated medium soft. This is installed between the tire and wheel so they resist moving while the car is cornering. For really high-grip tracks, use a firmer tire insert in the front with a softer insert in the rear.

INCLUDES: Two rubber inserts.