Spiny helmet

Spiny Helmet is a members-only item on the OSRS Grand Exchange in the armour category.

In-game examine text: "You don't want to wear it inside-out."

It has a Grand Exchange buy limit of 125 every four hours, a high alchemy value of 390 gp, and item ID 4551.

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Spiny Helmet currently has a flip margin of −172 gp, which isn't profitable to flip right now despite 585 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.