A technique for providing enhanced advertising over the Internet or an intranet is disclosed. The method comprising the step of establishing a deposit account on behalf of the customer with an escrow account provider. The nozzle is formed with an external-air intake groove. The method includes: forming a core of the medical device with a pattern on a surface of the core and assembling a multi-walled carbon nanotube array on the pattern on the surface. An end user can receive multiple videoaudio streams downstream while the end user’s videoaudio is transmitted upstream to the multicast network and is multicast to the end points. A JIS-C hardness of a surface of the core and a JIS-hardness of a center portion of the core satisfy a relationship of 1.