Minecraft wiki entry for Durability, associated text: Durability is a property that affects all tools, weapons, and armor, as well as certain other usable items. It represents the number of useful actions an item can perform and depletes upon item use. The bar starts at green, but as the durability decreases, the color turns to yellow, then orange, and finally red. When the durability is empty, the item is about to become destroyed. Durability may be increased by merging two damaged items or repairing them with materials in an anvil or a grindstone, or through the Mending enchantment.