About Vajra
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Vajra is a ritual scepter symbolizing compassion and skillful means, and also a symbol of indestructibility.
In tantric rituals, the vajra is the necessary counterpart of the bell, which symbolizes the wisdom of emptiness.
Vajra and bell are a set where both have the same number of spokes. Their number varies from one to one thousand, yet the most commonly known are the five-spoked ones called "Samaya vajra and bell" and the nine spoked called "wisdom vajra and bells".
The size of the vajra can vary from 4 inches to twenty, and the bell should be in proportion.