ELWire also commonly named Electrouminescent wire are special wire producing light when a voltage is applied to it. As it is flexible, you can adapt it to fit various shapre. As it is an electrical component, you can cut the wire and solder it to the next section (see the tutorials in the various product sheet.

[T] - ELWire Pack AQUA (2.5m)
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Fil electroluminescent BLEU AQUA 2.5m + Extra
12v 5A power bloc
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12v 5Amp Power supply, Continuous current