FEATURES: This Stirring ball Ensure nutrition dissolve more totally and quickly,No More Protein Clumps;Compatible with most sized cup or bottle allowing blend protein powders conveniently , MATERIAL:Stainless Steel Shaker Ball:Made of 304 Stainless steel, durable and healthy; Mixing Ball:PP material,100% FOOD GRADE, keeping nasty toxins at bay. , EASY TO CLEAN: Just rinse with water after use, and put it in the open air to dry will be ok;Easy to use and carry, suitable for shake bottle cup shaker , WIDELY APPLICABLE: Suitable for most of bottles with cover, Put the stainless cylinder or Blending Mixing Ball into the bottle and cover, then shake it uniformly , SERVICE: We provide the most efficient service to all customers. If you have any dissatisfaction, please contact us and we will solve it for you within 24 hours.