Fiber Optic helps bring light into hard to reach spaces. The optic strands are fairly flexible and carry the LED source light out to the end of the strand. The strands can be cut to the desired length with scissors. An LED source light is required to light up the optic fiber. 3mm and 5mm LED bulbs are a great choice because they can be sanded flat at the end to allow the fiber to be glued right to the bulb. Several fiber optics can be glued to the same LED. The Fiber Optic Connector (included) fits over the 3mm bulb and blocks any side light.
The Fiber Optic Master Pack includes a sample of several fiber optic options. 1 foot each labeled pieces of all 5 sizes of standard fiber optic, 2 sizes of side glow fiber optic and 1 inch each of 5mm and 3mm LED connectors.