Comparison : Item # 8050-21, Tissue Grinder, Tube, Dounce, 2mL
Item # 8050-22, Tissue Grinder, Tube, Dounce, 7mL
Item # 8050-24, Tissue Grinder, Tube, Dounce, 15mL
Item # 8050-26, Tissue Grinder, Tube, Dounce, 40mL
Item # 8050-28, Tissue Grinder, Tube, Dounce, 100mL