VWR* Spinbar* Stir Bars, Egg-Shaped, Assortment^ Ideal for use in round-bottomed flasks. Selection of 13, egg-shaped, PTFE* resin-coated, magnetic stirring bars comes in assorted sizes: one 76.2x19mm plus two each of 19x9.5mm, 25.4x12.7mm, 31.8x15.9mm, 38