Rune knife

Rune Knife is a members-only item on the OSRS Grand Exchange in the runes category.

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

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 100 gp, and item ID 868.

View on OSRS Wiki

Rune Knife shows an active flip setup with a margin of +10 gp and 528,654 trades over the last 24 hours.

At the buy limit of 11,000 every four hours, max profit per cycle is about 110.0k gp — high margin with healthy liquidity.