Fur

Fur is a free-to-play item on the OSRS Grand Exchange in the other category.

In-game examine text: "This would make warm clothing."

It has a Grand Exchange buy limit of 18,000 every four hours, a high alchemy value of 6 gp, and item ID 6814.

View on OSRS Wiki

Fur shows an active flip setup with a margin of +60 gp and 5,282 trades over the last 24 hours.

At the buy limit of 18,000 every four hours, max profit per cycle is about 1.08m gp — high margin with healthy liquidity.