Duplicated CDs are created using CD Recordables or CD-Rs. A CD-R is simply a blank disc that can be laser burned (recorded) with a CD/DVD recorder or computer burner. A replicated disc is the actual manufacturing of a CD or DVD. The process includes creation of a glass master that is stamped onto the CD in the form of tiny pits that your CD player can read. Duplicated CD-Rs are generally used for smaller runs of 500 or less. Replicated CDs are generally more cost effective if you plan on purchasing 500 and upwards. Please contact us directly if you have more questions or need help determining which choice is right for you.