Thicker gauge steel would make for sturdier construction and gives a heaviness into the cocktail shaker. Although lots of 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 sturdy glass that won’t crack https://shakercabinets70246.blogdon.net/top-shaker-cabinets-secrets-53541969