Baglamukhi yantra needs to be written or embossed on copper, brorze or Silver or Gold. It's worn in neck and retained inside the puja ghar. It’s pooja be carried out as a result of yellow beads, rosary and yellow costume by way of Beej Mantra being recited day by day. https://directorypile.com/listings13289898/the-definitive-guide-to-mantra