Each heading contains products, which are ultimately assigned an HSN code. Ferro-manganese under ferro-alloys, For example, bears the HSN code 72.02.01 – 01 being the product code under Heading 02 of Chapter 72. The HSN code for other products under ferro-alloys is 72.02.99. For better identification of goods, India and a few other countries use eight-digit codes for deeper classification. For example, 72.02.99.11 is the HSN code for ferro-phosphorus under other ferro-alloy products.