I've had a set of 1" aluminum pastry frame bars for quite some time thanks to the Chocolate Doctor - Kerry Beal, but recently I had our local glass shop make me these:
I can't remember the material but its not plexiglass. I think the material was like polycarb. They weren't cheap. The set of three (notice two different thicknesses) ran just about $175.
ChocGlitz & Cream – Albuquerque, New Mexico
4 days ago