Linco  Standard form's circular aperture's nipple (2 enter install  )  

Characteristic:   (S. M. L  hole) 
Nipple's all raw materials average pick up importation's food's grade liquid state xi's glue,  material quality safety,  not contain carcinogen inferior's saltpetre's ammonia,  innocuity tasteless endure high temperature,  accord with FDA standard.  special ventilate hole and projection Chuang thing designer but settle baby exertion suck milk's time take place nipple compressed,  hollow wait for situation.  let baby smooth suck breast,  and avoid suck enter overmuch air,  result in abdominal distension or burp.