conpewter is right. I just got an e-mail back saying they are glass.
The only 20 oz glass I saw was the 20oz beer mug for $3.49
'The taxpayer: That's someone who works for the federal government but doesn't have to take the civil service examination.'- Ronald Reagan
nice! been looking for a buy like this. Just ordered 15 of them.
it was a little over $7.
Bed bath and Beyond had 20oz mixers for $1.09 a few years ago. I bought 6, and they're all gone now.
You can reuse them, ya know.