This series of dolls is a new type of silicone head doll with movable jaws. Traditional silicone tips are very hard and cannot be opened. It's very realistic and pretty, but you can't blowjob. The dolls of the FLD·M series adopt advanced manufacturing technology, increase the jaw joint and optimize the internal space for real oral sex, making the mouth of the silicone head more realistic and oral sex available, just like real oral sex. So these heads are also called ROS heads.