The phurba is the embodiment of the Vajrakila Buddha, who is empowered to suppress all evil in the world. Its ritual use is first described in the Vajrakilaya Tantra, a Vajrayana text dating to the eighth century or earlier. 
The phurba, a three-sided ritual dagger, is primarily used in Tibetan Buddhism to exorcise evil influences and subdue negative forces. It's a spiritual weapon employed to pin down demons and negative energies, transforming them into positive forces. 
Obsidian is a metaphysical stone known for its powerful grounding, protective, and transformative properties. It is believed to shield against negative energy, promote self-reflection, and facilitate emotional healing. Obsidian can also help release blockages and encourage spiritual awakening.  These two elements combined together create a very unique and one of a kind pendulum. 
 
Length : 4 inches (10 cm)
 
Width:  0.75 in (3 cm)
 
Weight: 60 grams