All ends/tops come included w a barbell or post! This is listed only if you want extras or want to try a different length.
General size chart:
Navels: 14g 7/16th (11mm) curved barbells
Rook/Brow: 16g 5/16th (8mm) curved barbells
These are used in eyebrows, navels, rooks and daiths
these come included w titanium balls