08-06-2015, 11:58 PM
If you look it up on xivdb.com, the contentID of the material is the number that shows up in the address bar.
http://xivdb.com/?item/2588/Crayfish-Ball <-- contentID of 2588
http://xivdb.com/?item/2588/Crayfish-Ball <-- contentID of 2588