Box One Rear Derailleur Jockey Wheels Kit
Replacement jockey wheels for box one and an upgrade for box two rear derailleur. Compatible with both box one and box two 11 speed and prime 9 rear derailleurs.
Works as described
Would love to see this product made in a much stronger material than plastic. Most others that I have seen are made of metal which is much less likely to break. Just seems like too cheap of a design for not much return.