Professional 4-piece Boston cocktail shaker set. Crafted of high-quality food-grade 100% stainless steel. Dishwasher safe. Both shaker tins are weighted for a better shake and balance, unlike most of the other shakers where only one or none are. This set was made to fit with each other to create a perfect water-tight seal. The included Hawthorne strainer fits perfectly and provides a perfect pour. This Boston shaker set will not freeze shut, drip or spill when pouring.