It is a bead necklace, the beads are round and green at the edges and black at the center. When in use they spread out to form a barrier made out of energy.
It is an extremely powerful item and is quite famous even in the Sage Realm.
Seal: When activated it creates a powerful seal that not even gods can escape from. The seal looks like a giant spherical barrier whose boundariers are connected by the beads.
- In Journey to the West, this was in fact used on the Monkey King..