Actually, there are several different levels with Riedel. The Sommeliers are handblown, lead crystal. I have a few pieces. They are definately beautiful and definately not for your clumsy guests. The Vinum line is machine-made, yet contains 24% lead. The Ouverture line as well as the stemless "O"'s are made from potash and do not contain lead. Potash can take the heat of a dishwasher, where lead crystal doesn't appreciate the heat at all. I actually love the "O"'s. I use them alot as they are easy to clean. Some people do not like the fact that there is not a stem, they are afraid that the wine will heat up by being held. It will, but only slightly, unless you are at an event where you cannot put the glass down and hold it for an extended period of time. Not sure if this has been discussed (I'm new to the forum)....Riedel bought Speiglau recently. They will continue to be run as two separate companies. Have any of you attended a Riedel "Glass Tasting"? They are fun and showcase why there are different shapes for different varietals.