These Kyosho inner tire inserts are molded foam rings designed for 1/10 scale on-road touring car tires, providing the internal support needed to maintain proper tire shape and handling on the track. The yellow color coding corresponds to a specific foam density within the Kyosho KC Mold insert lineup. Four inserts are included in this set. Compatible with a wide range of 1/10 touring car platforms that accept standard-sized on-road tire inserts. Features: Yellow density-coded foam for easy identification Molded foam construction for consistent shape and support Set of 4 inserts Designed for 1/10 scale on-road touring car tires 7/7/26 cs