® Bar Shaker Set, 532 ml (18 oz), calacatta gold. Martini. This sophisticated shaker and stainless steel jigger keep cocktails and mocktails measured, mixed, and chilled for effortless entertaining. The richly veined pattern adds elegance and an instant upgrade to your bar. Featuring Therma-S'well™ technology - a triple-layered, vacuum-insulated construction made of high quality, 18/8, food-grade stainless steel walls plus a copper wall layer for superior temperature retention and a condensation free exterior. BPA and BPS Free. By choosing re-usable S'well products you can help reduce the use of single-use plastic products that pose a threat to our environment.