3 mirrors, each of size 18 cm x 4 cm. You get these mirrors, which are light and flexible because they have a plastic/acrylic background. So they don't break and are easy to cut etc. You should use those
You can get them in supermarkets, fancy stores, some fabric stores. In wholesale, you'll have to go to specific 'bazaar' areas of your city/town to get it, e.g. City Market in Bangalore, Chandni Chowk in Delhi, Burrabazaar in Kolkata etc.
