This is a Pair of Touring Car Shaped Soft Tire Inserts from Tamiya.

FEATURES: Inserts support the tire--similar to the air pressure in a full-size
car.
Soft compound is good for cooler track temperatures.
Maintains positive grip and provides an even contact to the ground.
Fits 1/10 scale touring car tires.
Blue foam construction.

INCLUDES: Two Touring Car Shaped Soft Tire Inserts.

REQUIRES: Tire
Tire Glue

SPECS: Inner Diameter: 1-7/8" (48mm)
Outer Diameter: 2-1/2" (63mm)
Width: 1" (25mm)