*Made of food grade 304 Stainless steel, durable and healthy USES:With shaking bottle/cup, makes your nutrition dissolve more totally and quickly *Suitable for most of bottles with cover, Put the stainless ball into the bottle and cover, then shake it uniformly *It's great to have a bunch of these to put in multiple cups to mix my drinks. *100% brand new and high quality Material: stainless steel Size: 4.5x5.5cm *3 Piece stainless replacement mixing wire whisk balls