ltem description from the seller
Color: White Yellow / White Blue
Material:
Tank: PET polyethylene terephthalate
Large button/top cover/bottom cover: PP polypropylene
Connector: POM Acetal Resin
Small button: ABS acrylonitrile-butadiene-styrene copolymer
Large spring/small spring: 304 stainless steel
Plug/seal ring: silicone
Weight: 380ml: 235g; 1100ml: 363g; 1800ml: 482g;
Packing quantity: 380ml: 75 pieces; 1100ml: 50 pieces; 1800ml: 50 pieces