CELLTREAT 229495 Centrifuge Tube and Cap 30mL , Self-Standing, Non-Sterile (Tubes and Caps in Separate Bags), 500/pk

30mL size is an ideal option for intermediate centrifuge tube volumes
Self-standing base for use without a rack
Molded graduations ensure volume accuracy to +/- 2%
Conical bottom for maximized sample retrieval 

Also, check out the Most Common Types of Lab Mixing Equipment