165n hollow breasts air filled?

[boobsniper]

my awesome bb dream doll I measured boobs just for comparison and general size for all others curious about biggest size dolls and noticed one boob is 22"circum around and other is 20" is it deflating? not real noticeable but curious they feel real thick wall kind of rubbery memory foam feel which is good heavy duty for extreme groping sqeezing its the hollow option is it air inside or cotton or fiberfill or foam pellets ?