Features: 7pcs type-B PTFE laboratory magnetic stir bar with high quality and stable performance. It features low temperature resistance, high reliability and good mechanical toughness. Choose the correct magnetic stirring bar to make it work perfect and avoid jumping when working. With the advantages of wear resistant, high temperature resistant and chemical corrosion resistant. Perfect for stir a liquid or solution in scientific research, industry, agriculture, health and medicine. Specification:Condition: 100% Brand NewMaterial: PTFE + Permanent MagnetUse: Magnetic Stir BarSize: Diameter (Widest) x LengthApprox. 4 x 10 mm / 0.2 x 0.4 inApprox. 8 x 15 mm / 0.3 x 0.6 inApprox. 8 x 20 mm / 0.3 x 0.8 inApprox. 8 x 25 mm / 0.3 x 1.0 inApprox. 9 x 28 mm / 0.4 x 1.1 inApprox. 10 x 30 mm / 0.4 x 1.2 inApprox. 9 x 35 mm / 0.4 x 1.4 inWeight: Approx. 30g / 1.1 ozPackage List:7pcs x Magnetic Stir BarNote:1. Please allow 1-2 mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.