The Spinbar® Capsule Magnetic Stirring Bar from SP Scienceware is suitable for stirring in awkward vessels, for gently mixing staining solutions above delicate gels, or for rapidly dissolving chemicals. The magnetic stirring bar is wrapped by a small flat capsule, allowing bar spins freely inside without contact with the vessel bottom or gel. The protective capsule is made from polystyrene with a diameter of 1 3/16 in.