Kantha is the Sanskrit word and Kantha meaning throat or Gala. When a special Kantha mala is made, it is a mala (a string of Rudraksha beads) which is traditionally strung together in wool.
Also kantha can be made with thread, gold, silver. It is a beautiful mala because of the number of beads and the spacers in between. It is highly powerful focusing more on the early benefit from the mala.
Kantha consists of same bead multiple times. And the benefits are multiplied to give early result.
We have 1 mukhi Kantha mala, 2 mukhi Kantha mala, 3 mukhi Kantha mala, 5 mukhi Kantha mala, 6 mukhi Kantha mala etc. The most common one is the 5 mukhi kantha mala. The most sought after is the Gauri Shankar Kantha mala.
The Kanthas hold the divine vibrations of the ruling deity and the positive energy is circulated through each Rudraksha bead which reaches the Sumeru bead and from there it is passed on to the body of the person wearing it.