shaker ball: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 100% brand new and high quality Material stainless steel Size: 4.5×5.5cm Package included: 3 Pcs Whisk Ballsimension: 1.96” x 1.77”,Package included: 3 Pcs Whisk Balls. Suitable for most of bottles with cover, Put the stainless cylinder into the bottle and cover, then shake it uniformly. This ball Ensure nutrition dissolve more totally and quickly. shaker ball:Compatible with most sized cup or bottle allowing blend protein powders conveniently. MATERIAL:Made of 304 Stainless steel, durable and healthy.