[SAY GOODBYE TO SMELLY PLASTIC BOTTLES] Traditional plastic shaker bottles easily become smelly and are tough to clean. metal shaker bottles are made from premium, kitchen-grade stainess steel that not absorb odors or stains, reduce your plastic use and Micro-type plastic exposure. [INNOVATIVE SHAKER BALLS] The silicone mixing ball is quiet and efficient, without noise, easy to clean, not easily damaged. The plastic mixing ball is quick and efficient to shake. You can choose which shaker ball to use according to different occasions and needs. shaker balls that all powdered additions are mixed up smoothly without lumps. [LEAKPROOF/SHATTERPROOF ] protein features a safe, leak-proof twist-on lid that ensures an airtight seal and no leakage. The lid 't burst open when dropped, no more accidental leaking/spilling leaving a mess and your day. If you find that it leaks during use, please tighten the cap, there may not be tightened to cause leakage. [PREMIUM PROTEIN ] is made of High quality material, which is strong, , and unbreakable. Stainless steel protein with 2 mixing ball that all powdered additions are mixed up smoothly without lumps, perfect for protein shakes, protein drink, pre workout drinks. [EASY TO USE AND CLEAN] Making health visible! Scale engraved on the visible window to adjust the water level as needed, and a wide mouth for easy adding of scoops and liquids. 28 oz has a comfortable rubber strap for easy carrying and has a , 100% leak-proof twist-on lid that is easy to open but stays secure while shaking or drinking. (Cleaning instructions: Hand wash, do not put in the dishwasher, it may cause leakage at the visible window).