These 16pcs set meets all your everyday needs. Small size are suitable for 25ml, 50ml, 100ml, 250ml, 500ml of beakers, while big size are for 250ml, 500ml, 1000ml, 2000ml, 3000ml of beakers .you can place inside a container of liquid or solution that is seated on a magnetic stirrer, and use a rotating magnet or multiple stationary electromagnets to create a rotating magnetic fieldWide application: the stir plate magnet bar can work with various types of magnetic stirrers or heating stirrers, and is often applied to stir a liquid or solution in scientific research, universities and laboratoriesQuality material: the rod magnetic mixer is made of quality , and cylindrical shape and surface will reduce friction and rotation, for laboratorycolor: WhiteMaterial: Package Contents:16 x magnetic barOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed is +/- 1-3cm.