I hope it's obvious why, but I don't think of "necks" as items. I can't imagine "neck" as as part of a "list, collection or set." Why? Because I'm not trying to separate people's or animals' necks, and most humans don't deal with necks as "an individual article or unit." Items are
- An individual article or unit, especially one that is part of a list, collection, or set.
1.1. A piece of news or information
1.2. An entry in an account.
Oxford Chinese Dictionary (2010) p 819.