That's what I figured. I have a "cheapie" set of cylinders that are very flimsy. Lately that's all I use, although I have enough syringes to stock a pharmacy, LOL. I don't want glass because I know I'll just break them. These look pretty good. I just have to remember to clear coat the numbers before I use them in case they wear off. It doesn't look like they are embossed onto the plastic.