Not sure if it is a Libbey tumbler or not. No markings on the bottom of it. I got them from Fairway Glass. I was using GL 70/30, with 1 oz per pound of FO. I have not added any color to them yet. I tried HTP's and thought the HTP 126, might do it, but started smoking about halfway down. The cotton's did the same thing. It is 3" wide and 3.5" tall. Tried a LX 24, but the flame was really dancing. Thanks for your help!