Speculum: 1)size : small , medium , large 2)Product structure : upper leaf ,lower leaf Specification : 1) Type: side-screw, center-screw, pull-push type, 2) Product structure : upper leaf, lower leaf 3) Product instruction: made of medical polymeser materials(polystyrene) , Sterilized by EO gas, sterile, non-toxic ,pyrogen free, the two leafs are in highly smooth rim and distance between the two leafs can be adjusted 4) Technical indication : in arrcordance with YY 0036 smooth, rounded ends for increased patient comfort transparent finish yields excellent visibility and sampling and examination accuracy available with or without locking mechanism