From what I have read the Medium domes have a base diameter of 11 cm.... or about. 4.3 inches accross..... Don't know the contoured but I thought they were the same just shaped more like a breast?
As far a what Lucy said... sure if you can get your breast into any dome they will technically work.... but how week.... in my mind the more skin exposed freely to the negative air pressure the more swelling g the better it will work... or the shorter the time it takes to get to your goal....
As far a what Lucy said... sure if you can get your breast into any dome they will technically work.... but how week.... in my mind the more skin exposed freely to the negative air pressure the more swelling g the better it will work... or the shorter the time it takes to get to your goal....