We are so proud to say that our CARA metal straws will not leave any metal taste behind when you are using them!This is due to the fact that all CARA metal straws are made from the highest quality of 304 stainless steel that is also FDA (Food and Drug Administration) graded and BPA free. This explains why CARA metal straws are the safest for usage!However, do make sure to rinse under running water or soak your CARA metal straws in luke warm water when you first receive them for hygiene purposes. :)