Magnetic stirring bar made of PTFE, with centric PEEK ring for reduction of friction and better concentricity with uneven vessel bottoms. For large vessels, turbulent mixing at low speeds. Length: 140 mm, diameter: 27 mm, diameter with ring: 35 mm. All materials are FDA compliant. Magnetic stirring bar made of PTFE, with centric PEEK ring for reduction of friction and better concentricity with uneven vessel bottoms. For large vessels, turbulent mixing at low speeds. Length: 140 mm, diameter: 27 mm, diameter with ring: 35 mm. All materials are FDA compliant.