Chandra Yantra, as the name signifies, negates the malefic effect of the Moon. Malefic effects of Moon are Urinary diseases, Lack of Mental Balance, insanity, nervousness, throat troubles, asthma, bronchitis etc Chandra Yantra is placed in the house or worn on any Monday of Shukla Paksha and is usually kept along with the image of Shiva. When moon is malefic in the chart or horoscope, Chandra / Moon Yantra is preserved in the house or pocket to negate the malefic affects of the Planet so that owner of that gets its blessing. Embossed on copper plate . Size 3"x3"