Kamdhenu (Kamadhenu) with calf - the wish fulfilling cow raisin idol Janeu Cat's eye mala is used

Cat's eye mala is used for japas of planet Ketu

though sometimes it’s displayed in art

They will hardly embark on a mission if they do not see themselves on the top at the finish

The Deru is a common accompaniment to ritual chants and is also used in the performance of popular folk songs

The reason is

Kamdhenu (Kamadhenu) with calf - the wish fulfilling cow raisin idol Janeu Cat's eye mala is usedKamadhenu (Sanskrit: Kmadhenu), also known as Surabhi ( Surabh), is a divine bovine goddess described in vedic scriptures as the mother of all cows. She is a miraculous "cow of plenty" who provides her owner whatever he desires and is often portrayed as the mother of other cattle as well as the eleven Rudras. In iconography, she is generally depicted as a white cow with a female head and breasts or as a white cow containing various deities within her