5OZ Food Grade Stainless Steel : It made by 18/8 STAINLESS STEEL, We need wash more time, use Liquor and Spirits wash this flask. A great gift and it stocking stuffer We recommend this to your best girl friend or bachelorette party, birthday gift, Mothers Day gift, etc. with a bottle of your favorite liquor to go with it Cheers . Warm tips for first use and conservation instructions: 1. Rinse the inside with clean, soapy water before filling the flask for the first time. 2. Always empty the flask after use no severe dropping, no high heat, and no acid liquid for long term. and rinse thoroughly before refilling. 3. Do not keep alcohol in the flask longer than a period of 3 days and to clean and dry thoroughly when not used. Easy Pour Funnel is Included , Beautiful and Nice Bling.This product came in a timely manner. And is very classy flask. Perfect gift. Great Quality and Cute,This is small but fit in any size purse... about 3-4 shots depending on your level..can be mistaken as a coin purse.