Linking Baubles only appear if the Baubles mod is installed along side TransportCraft. With it a total of nine baubles can be crafted, three rings, three belts, and three amulets. They can then be linked in the Transport Hub for the cost of one redstone dust and 8000 RF. When linked they take on a shimmer as though they were enchanted.
While wearing one of the baubles if a certain condition is met the player will instantly be teleported back to the Hub they were linked to, exactly as though they had used a Linked Pearl. This consumes the bauble. Caution should be taken not to wear more than one Linking Bauble as doing so can cause all such baubles to be consumed as they all try to teleport the wearer at once.
For standard Linking Baubles the above condition is the player's health dropping below 2 hearts.
For the Fall Triggered Linking Baubles the condition is any fall from a potentially fatal height.
For the Explosion Triggered Baubles the condition is that the player is about to be involved in an explosion.