Features 1、QUALITY MATERIAL: These magnetic stirring rods are made of PTFE magnetic material, which makes it more fluent to stir and mix, and is widely used in industry, instruments, and laboratories 2、WIDE TEMPERATURE RANGE: These magnetic stir bars are made of cold and heat resistant PTFE material and can operate at temperatures ranging from -196℃ to 250°℃ / -320.8℉ to 482℉ 3、WEAR AND EROSION RESISTANT: The mixing bar resists wear, erosion and high rotational forces, ensuring a consistent and stable mixing process 4、GLOSSY APPEARANCE: The smoother the mixing stick, the smoother the mixing. Can withstand high and low temperature, non adhesion, possess good lubricity 5、STRONG AND STABLE: This 8 piece blender kit is long lasting and wear resistant, ensuring stable rotation and trusted results for improved mixing and mixing efficiency Specification Item Type: Magnetic Stir Bar Set Material: PTFE Features: Withstand high and low temperatures, non stick, good lubricity Application: Industry, instrumentation, laboratory Size: Approx. 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 25mm / 0.98in, 28mm / 1.1in, 30mm / 1.18in, 35mm / 1.38in, 40mm / 1.57in Package List 8 x Stirring Bars 1 x Plastic Box