Slot Data

The Slot data structure is how Minecraft represents an item and its associated data in the Minecraft Protocol.

Slot
COMPOUND '' LIST 'StoredEnchantments' COMPOUND SHORT 'id' SHORT 'lvl' END COMPOUND ...     END ...   END INT 'Unbreakable' ... END

See NBT for more information about the NBT format, and for the contained information and its format. Note that tool durability is included in NBT, among other things.

Examples
00                     | empty slot 01 01 01 00            | a stone block 01 01 01 04 CA FE BA BE | a stone block with (made-up) NBT data