FIFTY/FIFTY double-wall vacuum-inslulated stainless steel bottles are made of lightweight 18/8 stainless steel that is recyclable, non-leaching and will not retain taste or odor. Available in a variety of sizes, from 18 oz - 64 oz, and in many fun color options, FIFTY/FIFTY bottles keep liquids cold or hot all day. I've been with the company since it started and look forward to working with you. Feel free to call or email with any questions. Thanks!