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✔ 18/8 STAINLESS STEEL PROTEIN SHAKER BOTTLE - This Protein Shaker Bottle is made from Surgical Grade 304 Stainless Steel 18/8.The Protein Shaker Bottle body is made of high-quality strong stainless steel. Extremely durable & easy to clean. Dropping a Gym Shaker at the gym or home happens quite frequently. Therefore, we made sure that our Protein Shaker Bottle can easily withstand multiple drops without breaking or cracking the bottle.