This is our new extra hard black inserts designed from high quality German foam that is designed to last a long time.
 
These inserts are xtra hard and high volume
the high volume helps to prevent air gaps once the tire stretches from use and tire sauce.
 
OUR NEW Black foam is  22 Shore A      - weights 12 grams 
-Item is sold as a set of Two (2)  foams.
 
Fits great in our tires and OTHERS
 
Foam Comparison:   Approx. #'s - changes per batch 
Our new Black inserts - 22 Shore A 12 grams