For the sake of safety,internal insula-tion material the use glass,theuse of outer pp,nipple use of silicone rubber . specification:250mlcolor:assortedmaterial:glass,pp,silicone rubbermodel number:BD024-4Apacking: 250ml glass sucking bottle for a box;advantage:1.For the sake of safety,internal insula-tion material use glass,the use of outer pp,nipple use of silicone rubber. 2.Adding insulation ...