Chai masala is available commercially at Indian stores and some specialty stores. It contains a ground combination of cardamom, cinnamon, black pepper and cloves. It is like the Indian spice blend garam masala, but without the cumin added. Chai may also be sold 'tea masala' or 'tea spice.' You can easily grind your own.
Basic Chai Tea is made with a lot of Oriental spices, it is easy to vary and fun to experiment with. Adjust the amount of spice to your taste,, or try adding mint, fennel, ginger, cloves or other spices as you wish