A mathematician named Klein
Thought the Möbius band was divine.
Said he: "If you glue
The edges of two,
You'll get a weird bottle like mine."
-Leo Moser

Our tiny glass Klein bottle necklace is a mathematician's delight! Handmade from high borosilicate glass and hung from . Each earring weighs 7g and measures 7cm (about 2.75 inches) from the top of the hook to the bottom of the bottle. They function properly, with a tiny opening all the way through the neck and into the bottle. So yes, the Klein bottle is an idea, and a product, that will hold water!