food-grade 304 stainless steel with exterior, rust FREE and super you any issue with the product ' s manufacturing or materials, we ' ll repair or replace the item for free No questions asked Easy to use for both beginners and experienced bartenders, a must-have cocktail shaker kit for professional bartenders and home cocktail lovers to make all kinds of drinks such as Margaritas, Daiquiris and Mojitos Dishwasher safe and also easy to clean by hand The tins can inside each other for low-profile storage when not in use Tins fit each other perfectly that ensures a water-tight seal every for time No leaks or spill and will not freeze shut when shaken with ice Unseals pretty easily when pour out the drink and provides a cleaner, dripless pour