Shaker Bottle (Set of 4) Pre and Post Workout Set with Stainless Steel Wire Whisk Ball Made of high-quality BPA- and Phthalate-free materials Holds up to 20 ounces each. Perfect for protein shakes, smoothies, pancakes and more Graduated measurements on side include markers up to 400mL and 12oz Seals in powder, mixes, and liquids with screw-on cap Stainless steel ball wire whisk breaks up powders and chunks for smooth results!