Yantra means an Instrument, Apparatus, Talisman or Mystical Diagram. It is not a magic as commonly believed.
Our Yantras are specially made in Thicker and High Quality Copper Sheets which are mainly used for making Photo Blocks [does not bend easily]. Gold is used for plating all our Yantras. Gold polish would remain as it is for a long period [many years] if the Yantras are kept Framed. Please do not dip or wash the Yantras in Water if you want the Gold Polish to remain for a longer period. You could clean the Yantras with a clean and dry cloth. The colour of copper would become visible after gold polish vanishes.
We do not do Prana Pratishta for any of our Copper Yantras [including the Panchaloha Maha Merus and Silver Yantra Lockets]. The worshiper [buyer] could do this himself/herself or get the same done on his/her own. We could send the simplified Prana Pratishta instruction on request after a person buys a Yantra or Meru from us.
We require 1 to 3 weeks time for making this Yantra and the shipment of this Yantra would take place only after it is ready.