Advanced Design: Unlike other protein shakers, Shakesphere Shaker Tumblers do not use a mixing ball or mesh grid to mix your ingredients. Instead, the patented capsule shape does the mixing by continuously spinning your ingredients in the capsule without getting stuck in the corners. Your shakes and drinks are blended smoothly and effectively without lumps. Easy cleaning, robust construction: The patented capsule shape without corners ensures that no powder gets stuck and prevents odours. Shakesphere makes cleaning a breeze. Made from BPA-free Tritan plastic, ShakeSphere's robust design is suitable for the dishwasher. Not dishwasher safe.