These tumblers are 20 oz and made of 304 stainless steel which is more durable than plastic. The double-wall vacuum insulated thermal design keeps your drinks warm or cold for longer periods of time. Tumblers come with splash-proof lids, metal straws and silicone bases. Shipping cost added to price of the tumbler. Please note that this merchandise will not be mailed until after Specialty, which concludes on October 26th, 2024.