Sigma welcome, The astadhathu shree yantra is a special shree yantra made up of eight metals mixed and moulded to give optimal results.Shree chakra/shree yantra is the abode of lalitha shree maha tripurasundari and houses all 330 million gogs.This mixture of eight metals make the yantra stronger,long lasting and able to attract divinity into your home than any standard yantra.It attracts maximum health ,wealth and prosperity along with correcting any vastu defects in your home/office. Regular puja to the shree yantra.