These are the 1/8 scale Truggy Shaped Medium Inserts from AKA Racing.
FEATURES: Constructed of special closed-cell foam Black in color
Medium compound
INCLUDES: Two 1/8 Truggy Shaped Medium Inserts
REQUIRES: Inserting in 1/8 tires
SPECS: Outer Diamater: 133mm (5.2")
Inner Diameter: 90mm (3.5")
Width: 60mm (2.4")