It's a shaker bottle. Nothing fancy here. Mix your protein drink up easier with an aluminum ball designed to slice its way through stale clumps of powder allowing for an easier dissolve. Hand wash and don't put in your dish washer unless you like warped caved-in plastic shaker bottles.
Best shaker bottle on the market.
SHAKE N BAKE!
Great value for your money and great local company
Couldn’t be happier with my Giant rubber weights!