Cobblestone Slab is a stone-based slab crafted from cobblestone. It generates naturally in plains villages, pillager outposts, and woodland mansions. Cobblestone slabs can be mined with any pickaxe. If mined without a pickaxe, they drop nothing. They can be crafted using cobblestone or obtained through stonecutting.

Cobblestone 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.