The feather-shaped mixing blade of the Migrating Bird mixer starts to turn and mix liquids when you press the lid. It rotates just like a bird soaring in the sky, swooping and turning, again and again. It is made of food-grade borosilicate glass. The green ring on top can be turned to adjust the amount of liquid poured out. Any left-over liquid can be stored in the glass container, for you to use whenever you like.