Advanced customization, you won't always touch those, click type and skull owner
1
Click Type
Affects actions that requires a click / right click, when set to "BLOCK", the action will only execute when clicking on a button, when set to "AIR" the action will only execute when clicking on the air and when its set to "BOTH" it will execute both on block and air clicks.
2
Skull Owner
If the item is a player head, set its texture to be someone's skin head by setting skull owner to his name.
