Commercial grade 304 stainless steel- Mirror finish With Removable Gel Freezer Packs Keeps bottles cold for up to 3 hours Keeps pre-chilled bottles cold for up to 3 hours without the mess of ice and water from traditional coolers. Commercial grade 304 stainless steel with mirror finish exterior. Fits one standard 750ml wine bottle or Champagne bottle. Includes four removable non-toxic gel freezer packs The top slides up and off for easy removal of the four gel packs. Stack them in the freezer for 4 hours and re-insert when it's time to chill.