BunMo Whisk Balls for Shaker Bottles - 3 Wire Ball Stainless Steel Mixer Balls for Protein Cup Shakes, Mixing Drinks and Shake Bottle Wisk Replacement. Includes 3 protein shaker balls to fit nearly any sized protein shaker cup. The classic design whisks together your drinks quickly and smoothly…just the way you like it! Made with high quality 304 stainless to ensure it is safe for you and your dishwasher too!