A stick of rock token is an item that can be received from redeeming a beach party ticket, obtained through activities during the Summer Beach Party or purchased through Sheldon. Activating it unlocks the stick of rock sword, both main and off-hand melee overrides, consuming the token in the process.
This item was only tradeable on the Grand Exchange while the Summer Beach Party (2015) event was active and was temporarily made obtainable during the Summer Beach Party (2020) as well as The Beach (2021) through the previous years tabs of the event store. Now it can only be traded directly with other players.
Once the stick of rock swords have been unlocked, activating the token is impossible.
For an exhaustive list of all known sources for this item, see here
This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!