Received from Ian Gower after the Gower Quest if all of your F2p skill are level 10 or above.
Uses:
Rub to gain 250xp in one of the following skills: Attack, Consitiution, Mining, Strength, Smithing, Defence, Fishing, Ranged, Cooking, Prayer, Crafting, Firemaking, Magic, Woodcutting, Runecrafting, and Dungeoneering.