Tis my belief that everyone here should watch this video from Discovery Channels How It's Made. Then tell me if they're hand made or machine made because while they use machines, to me these pipes are hand made. Machine made to me means that no hands were involved.
http://www.youtube.com/watch?v=BcmBL9bv_0I&sns=sms
http://www.youtube.com/watch?v=BcmBL9bv_0I&sns=sms