CB Japan Protein Blender Shaker Ball Set of 2 Mixing Ball santeco New, unused. Please refrain from purchasing if you are looking for a perfect item, as it has been stored by a private individual. ■Material: Polypropylene ■Heat resistance: 100°C ■Cold resistance: -20°C [Brand Information] SANTECO's mixing balls are perfect for protein shakers. Comes in a set of 2, making them convenient to carry. [How to Use] Simply add water and protein to the bottle, then add the mixing ball and shake to mix easily. Ideal for those who want to easily consume protein. [Features] This mixing ball is designed to mix protein evenly, making it less likely to clump.