Description: -Blue Optolythic Rod Shown Above -From - DS9 Episode "In The Pale Moonlight" - by VirtuquestAn optolythic data rod is Cardassian technology that is used to store information and records. These data rods are unique in that they are only produced on an as-needed basis, and information can only be inscribed on them once and cannot be altered thereafter.Contruction:These Optolythic Data Rods are constructed of translucent blue colored extruded acrylic plastic, measure 1/2 inch diameter and are approx. 3 1/2 inch in length. They are decorated with colored chrome tape - Silver.