It is important to select an appropriate size and shape of the magnetic stirring bar (magnetic flea) to make your stirring process more effective. Here's an overview to the different types of magnetic flea used for different purposes: 1. Cylindrical Stir Bar: Generally used for smooth stirring. 2. Plain Stir Bar: It is almost similar to cylindrical stirring bar, but provides more turbulence at low speed.  3. Spherical Stir Bar: Used for stirring in test tubes or eccentric test tubes