Thicker gauge metal helps make for sturdier design and provides a heaviness towards the cocktail shaker. Whilst several Boston shakers are made of tin for more secure shakes, the glass rim on this Kotai shaker is tempered—the rim is heated up and cooled down for tough glass that won’t crack https://codyvtohb.tribunablog.com/helping-the-others-realize-the-advantages-of-shaker-cabinets-51733282