StatTrack tokens can be applied to weapons and armour. StatTrack armour will track the amount of times it has been hit whereas StatTrack weapons (swords, bows, etc) will track the amount of hits they have made. StatTrack axes, pickaxes and spades will track the amount of blocks they have broken.
Each token can only be used once, they are available on Factions, Skyblock and Ulti. Type /stattrack to see how many tokens you have. Type /stattrack apply whilst holding an item to make it a StatTrack item (costs 1 token).