Half round tapered Teflon* PTFE stirring bar fits conical bottom centrifuge tubes. Can be trimmed to fit. Half round Teflon* PTFE stirring bar fits round bottom of 16 mm OD test tubes. 13.7 mm wide.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.