Northwind 6 Piece Mini Stackable Wine Glass SetCheers! The Northwind Mini Stackable Wine Glass Set is a classy, nautical-themed set of glassware that's designed for onboard use. These glasses are made of unbreakable MS material. MS material is one of the most knock-resistant materials in the sailing world! The mini wine glasses are small in size and are stackable, occupying minimum space on board. To match the other Northwind pieces, these glasses have a navy blue stem with a compass rose design.Features: Set includes six glasses; Northwind series glassware; Small in size and stackable to save space; Made of unbreakable material (MS); These glasses have been designed for use in normal, not extreme, conditions. Not suitable for very hot liquids or use in the microwave. These glasses can be washed in the dishwasher, but in the upper tray only. To extend the life of the product, avoid using abrasive cleaners.