QUANTITIES LIMITED.  These tuning rounds go on the side of a anti-foam insert to fill the tire more. Great for wide rims, wide tires, or for even better sidehilling.  ONLY works with 4.19" inserts. 4pcs per package which is enough for one truck adding one tuning round per tire.
 
Dimensions: 95mm x 3mm
 
Comes in either Gold or Black.