PPT Electromagnetic Radiation PowerPoint Presentation, free download Do All Types Of Electromagnetic Radiation Have All About Radiation Electromagnetic Spectrum Visible Light Prism Electromagnetic radiation visible to the human eye? Answers Information About Color And Light. The RTD LIGHT POST combines the most modern aspects of translucency and radiopacity with the 2 stage taper design that made RTD's fiber posts world famous. Made from quartz fibers, the LIGHT POST is available in 3 sizes. Its overall design is tapered, to conserve tooth structure, and is comprised of two cylindrical sections, which provide maximum surface area for bonding and maximum bulk for strength. Curion is proud to be the only authorized and exclusive distributor of the Double Taper Light Post IIllusion X RO posts in Canada. All RTD by Dentsply products sold by Curion are backed by the manufacturer's warranty.