Type1 and Type 2 glass Taper, round head, bend and calibrated droppers The teat are silica gel, PVC, ... are customized ;2 The categories of glass droppers are taper, round head, bend and calibrated droppers.3 The wall thickness of the ... .9mm, and outer diameter is 5.5mm 6mm and 7mm.4 The teat raw materials are silica gel, PVC, natural rubber ...