Working with experienced tasters, Riedel discovered that wine enjoyed from their glasses show more depth and better balance than when served in other glasses. Praised in 1991 by Robert Parker, Jr., publisher of The Wine Advocate, as "The finest glasses for both technical and hedonistic purposes are those made by Riedel”. Thanks to worldwide demand, Riedel Sommeliers is now the wineglass benchmark and of hand-made glasses in the world. Riedel glass-makers invest their talent, know-how and meticulous craftsmanship in making glasses of the impeccable quality consumers expect. Riedel Sommeliers are executed in over 24% lead crystal. All Riedel Sommeliers Crystal Glasses are Grape Variety Specific.