The drop trick is a technique used to gain multiple items that can normally be obtained only once. These items will not be awarded to the player if they are already in the player's bank account, player-owned house, or inventory, or in some cases, dropped where they stand.
The drop trick involves obtaining an item, dropping it, then repeating the action that first granted the item. The player can then pick up the dropped copies of the item.
A player's only limit is the amount of time a dropped item remains visible before disappearing. Once the time limit is reached (two minutes), the dropped items begin disappearing as fast as a player can obtain new ones.
One method of getting around this is to take the items to the bank and note them (if they can be noted). A player must then repeat the creation process above, dropping the noted form of the item prior to gaining more. They can then return to noted form as many as they wish, thus obtaining a limitless amount of items.
Another method will work if the item is able to be traded on the Grand Exchange. By putting the items for sale, the items are no longer in the player's possession, and the creation process above can then be followed. Offering the item for a very high price is recommended to make sure it is not sold.