Essential equipment for the well-appointed bar, our Boston Shaker is the same two-piece shaker preferred by professional bartenders. Consisting of a pint-sized glass tumbler topped by a stainless-steel shaker, it's considered the best barware for mixing classic cocktails like a Manhattan, Cosmopolitan or Sidecar. Easy-to-use two-piece shaker makes mixing perfect cocktails absolutely foolproof. Start by measuring ingredients into the glass tumbler, then cover with the insulated stainless-steel shaker and shake until the metal feels very cold to the touch. Double-wall insulation keeps condensation from forming on the metal shaker. Glass tumbler designed to fit inside metal shaker for compact storage. A tight seal guarantees leakproof operation. Top-quality cocktail bar essential provides years of dependable service. Dishwasher safe. A Williams Sonoma exclusive.