Sassy Flexible Mixing Bowls allow for an easy, more efficient, and bubble-free mixing of alginate, plaster, stone, and investments. These bowls are resistant to most chemicals, solvents and oils making them easy to clean! Just flex the bowl and then wipe it clean! This allergy approved, latex free flexible bowl is a must have addition to any office or lab. Sassy Flexible Mixing Bowls can be used with most automatic alginate mixers.