[H3N51N]

I feel like they're an often overlooked collectible. Yeah, they're tiny & don't do much but they do have some value & are interesting in concept. So I wanna discuss them with someone. Especially after my interest in getting the Showa Masks. What are your experiences with these little heads? Do they vary in size? Do some come with lights like I've read or is that not true? Are there reasons why you like or don't like collecting them? Thanks in advanced!