Celltreat 229462 Oak Ridge Style Centrifuge Tube, Round Bottom, Polypropylene, Screw Cap, Non-Sterile, 50 mL, Clear (Pack of 12)

I tried to put 50 mL in there and they are less than that (maybe 40 mL). There not the old ones that were closer to 60 mL, and they are noticeably smaller. Also it's hard to tell form the picture, but the opening is not wide mouth or flat, it's smaller than the sides. I can't speak to whether they can withstand high speeds yet. I'm not really thrilled but they are cheap.