Lead bar

Lead Bar is a members-only item on the OSRS Grand Exchange in the bars category.

In-game examine text: "It's a bar of lead."

It has a Grand Exchange buy limit of 10,000 every four hours, a high alchemy value of 16 gp, and item ID 32889.

View on OSRS Wiki

Lead Bar shows an active flip setup with a margin of +59 gp and 126,003 trades over the last 24 hours.

At the buy limit of 10,000 every four hours, max profit per cycle is about 590.0k gp — high margin with healthy liquidity.