The Black Thread dipped in Mai are used for controlled blood flow through the veins. It should not be tied tight. and it also absorb the warmth from the sun and keeps the nerves warm . When the nerves are calm and warm you wont be afraid of dark. Black Thread Bracelet or Kala Dhaga Bracelet wearing in the wrist is Significance: It is said to keep children away from evil eye (Buri Nazar). It also keeps away people from the evil spirit or unwanted tantra mantra done.