Premium food grade Stainless Steel (18/8, 304) has no BPA, phthalates, lead or toxins to leach into your drinks! Stainless Steel is one of the most hygienic surfaces for food and drink. Anything made from Stainless Steel should not end up in landfill! It is 100% recyclable!Stainless Steels unique surface has no pores or cracks to harbour dirt or bacteria. Neither will it affect or retain the flavour of your drinks.