1. PROTEIN – Made of quality, strong, durable, and unbreakable material. The stainless steel shaker comes with two mixing balls to ensure smooth blending without lumps, for protein shakes, preworkout drinks, and other supplements. 2. INNOVATIVE SHAKER BALLS – The silicone mixing ball operates quietly and efficiently, is noiseless, easy to clean, and resistant to damage. The plastic mixing ball shakes quickly and effectively. Choose the right ball for different occasions and needs to achieve a smooth, lump mix every time. 3. LEAKPROOF SHOCKRESISTANT – Features a secure, leakproof twist lid that provides an airtight seal to prevent spills. The lid stays firmly closed even when dropped, eliminating accidental leaks and messes. 4. NO MORE SMELLY PLASTIC BOTTLES – Traditional plastic shaker bottles retain odors and are hard to clean. Our stainless steel shaker is made from quality, kitchengrade stainless steel that resists odors and stains, reduces plastic waste, and minimizes microplastic exposure.