Yguang 5 Pack Formula Mixers, Milkshake Protein Shaker Ball for Small Bottle

1.Material:Made of food grade 304 Stainless steel, durable and healthy2.Uses:With shaking bottle/cup, makes formula or your nutrition dissolve more totally and quickly3.1-1/5-Inch (30mm) diameter - fits most formula bottles and small shaker4.Easy to clean.How great to have a bunch of these to put in multiple cups to mix my drinks.5.Note:this is for formula or small-bore nutrition shaker.Use 3 or more for your bigger shaker if you like