Buddhism tells its followers that they must perform difficult practices to reach Nirvana, but Kalacakra Tantra tells believers that they can use simple techniques to obtain happiness in this world. These Kalacakra Tantra instruments were found in the tomb of Prince Zhuang. This reflects the influence of the Gelug Sect of Tibetan Buddhism on the spiritual life of the aristocrats at that time.
In India, the Vajra is a legendary weapon, usually show with five prongs. Later, as an instrument in Tantric Buddhism, it was used to symbolize the steadfastness and sharpness of wisdom, which can ward off troubles and destroy demons. These vajra have four prongs and are of the type commonly used as pendants on costly prayer beads.