Vajrasattva is representative of purification and is visualized during the practice of Ngondro and many other sadhanas. These tsa tsa's were originally designed and manufactured to fill the kudung stupas of H.H. Dudjom Rinpoche and Kyabje Thinley Norbu Rinpoche and Lama Tharchin Rinpoche's memorial stupa at Pema Osel Ling. They are made of sacred substances and were consecrated along with the stupas. Each tsa tsa is sealed with mantra.