Material: Whisk ball is made of food grade 304 stainless steel, durable and healthy, use the ball with shaker bottle or cup , Size: The diameter of protein shaker ball is 5.2cm/2 inches, the height is 4.5cm/1.78 inches, suitable for most of bottles with cover , Funtion: Blender whisk ball are used to mix your protein powders, healthy greens, milkshakes,tea with milk and diet shakes,etc , Easy use: Just put the stainless ball into the bottle and cover, then shake it uniformly, your nutrition dissolve more totally and quickly in bottles , Easy Clean: Whisk ball is easy to clean,just rinse the water or put it in the dish washer