HEAD
in the item name to be able to display the head of the player who opened the GUI.material
data
amount
durability
name
glow
lore
enchants
ENCHANT,ENCHANT_LEVEL
List of enchantments available: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/enchantments/Enchantment.htmlβflags
modelID