Lysis Tube W is a 2.0 mL tube with screw cap (red) containing a mixture of ceramic and steel beads (1.4–1.6 mm and 3.5 mm) for efficient disruption of stool, bacteria, fungi and soil samples as well as cell cultures and spores using SpeedMill or other homogenizers. Lysis Tube W is a 2.0 mL tube with screw cap (red) containing a mixture of ceramic and steel beads (1.4–1.6 mm and 3.5 mm) for efficient disruption of stool, bacteria, fungi and soil samples as well as cell cultures and spores using SpeedMill or other homogenizers.