An important element of Tantric practice are tantric deities and their mandalas. The major cults are Vajrayana Buddhism and Tantric Hinduism. Yoga is a significant practice in Tantric Buddhism. Tibetan medicine borrows many concepts from Yoga through the influence of Tantric Buddhism. The group employed techniques from Buddhist, Tantric, and rare Hermetic texts. The bell is the most commonly used of all musical instruments in tantric Buddhist ritual. The means of worship in the Hindu Tantric practice differs from the Vedic form. Many of the elements found in Buddhist tantric literature are not wholly new. Buhnemann notes that deity mantras are an essential part of Tantric compendia. The Palas were followers of the Mahayana and Tantric schools of Buddhism. Padmasambhava introduced the people of Tibet to the practice of Tantric Buddhism. They were followers of the Mahayana and Tantric schools of Buddhism. The Vajrayana tradition further develops the aggregates in terms of mahamudra epistemology and tantric reifications. The Dunhuang manuscripts also contain Tibetan Tantric manuscripts. The institution developed ties with Tibet and became a centre of Tantric Buddhism.