Pyrex® centrifuge tubes, conical with screw cap capacity 50 mL, with graduations | Sigma-Aldrich
Corning 99502-5 PYREX® 5mL Disposable Glass Conical Centrifuge Tubes without Screw Caps - C1945-5 - General Laboratory Supply
Corning Pyrex 8084-15 Glass Conical Cylindrical 15mL Centrifuge Tube with White Graduations and Standard Taper Pennyhead Stopper (Pack of 12): Science Lab High Speed Centrifuge Tubes: Amazon.com: Industrial & Scientific