Mithril knife

Mithril Knife is a members-only item on the OSRS Grand Exchange in the bars category.

In-game examine text: "A finely balanced throwing knife."

It has a Grand Exchange buy limit of 7,000 every four hours, a high alchemy value of 16 gp, and item ID 866.

View on OSRS Wiki

Mithril Knife shows an active flip setup with a margin of +50 gp and 184,807 trades over the last 24 hours.

At the buy limit of 7,000 every four hours, max profit per cycle is about 350.0k gp — high margin with healthy liquidity.