This sleekly designed stainless steel tumbler is not only visually appealing but also features Biomaster, an anti-microbial agent that provides an additional layer of protection against harmful bacteria. Both the body and lid are treated with Biomaster, which is embedded in the material for permanent protection. The product’s anti-microbial effectiveness is tested according to ISO 22196 standards. Importantly, Biomaster does not compromise the item’s recyclability. Additionally, the tumbler includes Verimaster, a unique tracer embedded in the material to verify the presence of Biomaster. The tumbler has a closable lid, a polypropylene inner layer, and a stainless steel outer layer, with a capacity of 250ml. It is also BPA-free.