Features Resistant to strong acid, alkali, various organic solvents Made of PTFE material, non-toxic, high/low temperature resistant Strong magnetic, precise size, stable performance These stir bars work with magnetic stirrer Applicable for school laboratory, biochemistry, scientific research, etc Specification: Item Type: Type C Stir Bar Material: PTFE Length  Diameter Quantity 10mm     4mm       1pcs 15mm     6mm       1pcs 20mm     6mm       1pcs 25mm     7mm       1pcs 30mm     7mm       2pcs 35mm     8mm       1pcs   Features: Made of PTFE material, non-toxic, high/low temperature resistant. Resistant to strong acid, alkali, various organic solvents. Strong magnetic, precise size, stable performance. These stir bars work with magnetic stirrer. Applicable for school laboratory, biochemistry, scientific research, etc. Package List: 7 x Stir Bars Package List