1.08 by 1.08 inches square with baille;
Sanskrit numerals form the magic square associated with the holy Sun and the number one. Gold is the ideal metal here.
The numbers will touch your skin.
Moon and Venus yantras, ideal in silver, are also available in this store. All other grahas ("planets" in Jyotish or Vedic astrology) are available by request.
See the book Numerology by Harish Johari for more information.