One blaze rod can smelt twelve items, burning for 120 seconds. One coal/charcoal can smelt eight items, burning for 80 seconds. Blaze rods are the best non-lava bucket source of smelting fuel in the game.

You'll need to hunt down a blaze, hope it drops a rod, and then crush that rod into powder on a crafting table if you want to acquire some. Once you've got some, there are several things you can craft with it.

Akintunde Abiodun Timileyin (born 16 February 2000), known professionally as T.I Blaze, is a Nigerian singer, and songwriter currently signed to Dvpper Music.