Contigo, 28 OZ, Clear With Black Lid, Shake & Go Fit Bottle, Rounded Bottom Shaker Ball Designed To Work Together In Shaker Cup To Help Reduce Clumps & Buildup Common In Other Protein Shaker Bottles, Leak Proof Lid For Clean & Easy Shaking & Mixing, Convenient Volume Markings For Easy Measuring, Fits Most Car Cup Holders.