Details: Wow!! That's what students will say when they see the colors of the spectrum using the Flinn C-Spectra. The vivid spectrum with distinct color separations helps students understand and enjoy the spectrum. The best feature of all is that you'll no longer need to strain your eyes using those old spectroscopes. No matter where you look through the C-Spectra, you will always easily see the spectrum. C-Spectra won't bust your budget either. One 8" x 10" sheet can be cut to provide 30-1-1/2"-square pieces-enough for an entire class. 225 lines/mm.