The memory modules are provided on a black plate with black passive heatsinks (heatspreader) which are supposed to enhance the memory cooling also with higher frequencies and/or higher voltages. Thus one achieves on the one hand better results with overclocking and on the other hand a longer life-time, whereby Crucial by the way grants lifelong warranty (Limited Lifetime Warranty) for the buyer (all informations to manufacturer conditions are of course without guarantee by ocinside.de).
Another feature are the eight green and eight red light emitting diodes (LED) on each memory module. The LEDs atop shows the RAM traffic, so one can see the activity of the memory modules at any time. Close to the pins within the lower range of the PCB are integrated additionally eight further blue LEDs to lighting the PC. All in all a fancy feature for modded PCs and Macs.
As you can see on the next picture, the Crucial Ballistix Tracer modules illuminate nearly the whole PC … 🙂