Thicker gauge metal makes for sturdier building and gives a heaviness to the cocktail shaker. When many Boston shakers are made of tin for safer shakes, the glass rim on this Kotai shaker is tempered—the rim is heated up and cooled down for tough glass that gained’t crack or shatter https://codynywkq.eedblog.com/37483103/shaker-cabinets-fundamentals-explained