[7 SHAPES OF STIR BARS & 1 MAGNETIC RETRIEVER FIT ALL YOUR NEEDS]This stir bar set is a solid professional equipment. Stirring rods of shapes for greater turbulence and stronger vortex, 1pc recycling retriever for stir bar retrieval after mixing is done, free from polluting solvents. [PTFE PTFE MATERIAL]The stir bar is coated with PTFE, which can be used with chemicals, and helps reduce friction and wear to lowest while stirring liquid. [NON-ADHESIVE]Built in pivot ring, the magnetic stir bar will perfom its job well and spin in solvents smoothly and balantly, free from vibration and adhesiveness with solvents. [WIDE-RANGE TOLERANCE OF TEMPERATURE]The magnetic stir bars maintain good mechanical toughness between 196 Celsius~250 Celsius, still performing well with 5% elongation even if temperature reach its limit of -196 Celsius or 250 Celsius. [WIDE APPLICATION IN ALMOST ALL SOLVENTS]The magnetic stirrer can be used in most solvents, with high inertia as well as resistance. It is also corrosion resistant, non-adhesive. Colour: white Material: PTFE Package Contents: 1 * Oval stir bar 9x25mm 1 * Gear shape stir bar 7x40mm 1 * Olive stir bar 12x26mm 1 * Octagoal stir bar 9x30mm 1 * Cylindrical with ring stir bar 9x28mm 1 * Cylindrical stir bar 8x35mm 1 * sharp stir bar 10x40mm 1 * Magnetic Retriever 9x250mm Only above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.