Lightweight: The weight is very light, you can'for t even feel its weight when you wear it Small size: Small in size, can be carried around as a keychain Premium The outer for shell is ABS and the inner for tank is zinc alloy corrosion-resistant., sturdy and not easy to break Sealing well: Excellent sealing, the lid and soot will not fall out Great gift: Excellent pendant, can also be given as a gift to a friend