This kit comes in two pieces – a vacuum formed mask and beak section. Both parts have been vac formed from .060″ white styrene plastic and will need trimming, assembly, and painting before the prop is completed.
Mask is one-size-fits-most, and has been sculpted for female wearers specifically. It will fit men, but the proportions might be slightly smaller depending on your build. Eye holes measure 1.28″ distance from inside corners and 2.5″ apart from center of opening. Mask measures 7″ wide at widest point but is flexible to allow for some adjustment.
(I wear a 7 3/8 hat and it fits me rather comfortably.)
Image of trimmed mask is for reference only – parts will come untrimmed and un-assembled.