Ruyi Jingu Bang

Ruyi Jingu Bang (如意金箍棒; pinyin: Rúyì Jīngū Bàng, literally meaning "Ideal Golden-bound Cudgel"), or simply as Ruyi Bang or Jingu Bang, is one of the Four Sacred Weapons of China. It is wielded by Sun Wukong, the Monkey King.

Attributes
It weighs such a tremendous amount that no one except the Monkey King has been able to wield it. Weighing 13,500 jīn, which is roughly 12,420 lbs. or 8,100 kg, a single blow can be devastating to a victim. Despite this, the Monkey King can wield it with ease.

The Jingu Bang is capable of shifting size at the Monkey King's whim, allowing it to grow to great lengths or shrink to a size as small as a sewing needle.

Behind the scenes
The Jingu Bang takes inspiration from the mythological weapon of the same name.