Exposed Cut Copper Slab is a cut copper variant of a slab that has begun the oxidation process. It generates naturally in trial chambers. Exposed cut copper slabs can be mined with a stone pickaxe or higher. If mined without a pickaxe, they drop nothing.

They can be crafted using exposed cut copper or obtained through stonecutting. Over time, they will continue to oxidize into weathered and then fully oxidized states unless waxed with a honeycomb to preserve their current appearance. Exposed cut copper slabs function like other slabs in terms of placement and collision. They can also be placed under note blocks to produce a bass drum sound.