Stainless Steel Classic Water Tumbler: Tumbler is made of gauge 18/8 stainless steel with an extra spray painting . good rust resistance . durable and convenient to use . easy to clean (with cleaning brush)Vacuum Insulation: Classic tumblers are double walled and vacuum insulated . by the pool . at the office . in your car . whereverTumbler keeps your favorite drinks icy cold or piping hot for hours . also combined with a splash resistant lid and you get additional thermal controlCopyrights 2023 By Computer Werx LLC . All Rights Reserved