Walt, They are the Sennheiser PX100. Someone had said that they were discontinued and replaced by the px200, but from what I have been able to research, this information is incorrect. The px100 are open air headphones while the px200 are closed. They both use a folding design. Bothe the px100 and px200 seem to be available on the net so it will depend on whether you prefer open air or closed design. Personally, I prefer the open air because I can listen just fine and still hear what is going on around me. Others may prefer more sound isolation and would go for the px200. Warmest regards, Rick Alfaro rick.alfaro@xxxxxxxxxxx -----Original Message----- From: bookport-bounce@xxxxxxxxxxxxx [mailto:bookport-bounce@xxxxxxxxxxxxx] On Behalf Of Walt Smith Sent: Friday, November 23, 2007 11:01 AM To: bookport@xxxxxxxxxxxxx Subject: [bookport] Sennheiser headphones - what's the model number? What's the model number of the folding Sennheiser headphones that many people have bought to use with the BP? It's the same model that was recently mentioned here as being available for an especially good price, except that I missed what was apparently a one-day offer. Thanks. -- Walt Smith - Clearwater, FL ka3agm@xxxxxxxxxxxxxxx