screw top vial, 2 mL, clear, with write-on spot, 100/pk 5190-9589 Recommended caps for vials: Description Part Number Screw cap, bonded, blue, PTFE/white silicone septa, 100/pk 5190-7021 Screw cap, bonded, blue, pre-slit, PTFE/white silicone septa, 100/pk 5190-7023*