Hello Again: Regarding my earlier posting, the information I was given yesterday by the person who answered the phone was in error. Today a more experienced person answered the phone, and the 4mm Nano-Tubes are actually still available. My apologies to Varian. I've received a couple of comments about the Wilmad-Labglass version of the nano-tubes, and I'm still interested in that option. If I get enough information, I will post a summary for those who are interested. Cheers, -Rich Shoemaker --- Richard K. Shoemaker, Ph.D., Director, NMR Spectroscopy Facility University of Colorado at Boulder Phone: (303) 492-7062 Fax: (303) 492-5894 E-Mail: Richard.Shoemaker@Colorado.edu --- "It is amazing what you can accomplish if you do not care who gets the credit" (Harry S. Truman)