24-ounce capacity (note: measurements only go to 18 ounces) sleek and durable Pro24 shaker cup for mixing protein shakes, smoothies, and supplements Patented mixing system uses 316 surgical-grade stainless steel BlenderBall wire whisk found only in BlenderBottle brand shaker cups Screw-on lid creates leak-proof seal, and secure flip cap with SpoutGuard keeps the mouthpiece clean; wide loop top for easy carrying or attaching keys Wide mouth makes it easy to add mix scoops and liquids, and embossed markings measure both ounces and milliliters; rounded base for thorough mixing Made of BPA and phthalate-free, stain and odor-resistant durable Eastman Tritan plastic; dishwasher safe