Dubblin Dubb & Shaker Gym Shaker Bottle, BPA Free Stainless Steel Sipper Bottle with Protein Shaking Spring Ball, Detachable Glass For Drinking -Capacity -750 ML. Premium Quality Stainless Steel Gym Shaker Bottle, Strong And Reliable Shaker For Your Protein Shakes.A Great Alternative For Your Plastic Mug Shaker.The Stainless Steel Shaker Research Doctorate Is Strong And Durable.It Features Strong Lid With Sipper.That Helps Prevent Any Leakage In The Gym Bag. This Shaker Bottle Comes with Detachable Glass , It Can be Used as Storage Cup Or For Drinking. This Dubb Shaker Comes with Stainless Steel Spring Ball , Mix Protein Shakes and Store Nutritional Supplements with Ease.