The Copper Bars is a decorative and semi-transparent block used primarily for barriers and architectural designs, serving as the copper variant of Iron Bars. Crafted from six Copper Ingots arranged in two horizontal rows in a 3×3 crafting grid, the Copper Bars shares similar functionality to its iron counterpart but gradually oxidizes over time through four stages — Unoxidized, Exposed, Weathered, and Oxidized — changing from bright orange to teal. Applying Honeycomb creates a Waxed Copper Bars, halting the oxidation process and preserving its current state.

The Copper Bars can connect seamlessly to other bars, solid blocks, and fences, allowing for flexible designs in builds. It is waterloggable, non-flammable, and provides partial transparency, making it ideal for windows, cages, and decorative railings. The block can be mined with any pickaxe to drop itself, and lightning or axes can remove oxidation. With a hardness of 5 and a blast resistance of 6, the Copper Bars offers both visual appeal and durability, adding a warm, metallic accent that evolves naturally over time.