Recently we have sent a replacement out to all our buyers that had purchased the previous version of TSB-b4 (light green top) from 2012 to 2015.
This was due to the poor performance and durability of the material from which it was made. We replaced it with version TSB-b5. If you have not received your replacement, you can contact us directly with proof of purchase, and we will ship the replacement to you free of charge. See image below of the recall ball TSB-b4: