This is the Pro Molded Inner Foam Inserts for 24mm Tires from HPI.
FEATURES: Rubber tire inserts.
Helps increase grip and stability of tires.
Prevents tires from caving in during high speed & cornering.
Orange, and Rated SOFT-SOFT/MEDIUM.
INCLUDES: Two rubber inserts.
SPECS: Width: 20mm (0.79")
Outside Diameter: 60mm (2.36")
Inside Diameter: 46mm (1.81")