Baubles is a small mod and API by Azanor, which was temporarily taken over by Vazkii until Azanor returned, that is meant to be used by other mods to add additional player inventory slots. The Baubles inventory can be accessed by pressing the b key, by default. This inventory is different from the normal inventory; it adds an amulet, a belt, and two ring slots. As of the 1.10 version, it also adds a head, body and charm slot. Baubles doesn't add very much content itself, apart from the Miner's Ring. The idea is not to add content, but to be an addon for other mods that add inventory slots.