Thin, Waterproof, pre-wired, and reliable: LED Ribbon Strips

Specifications:

Size: 0.32 inches wide x 0.09 inches tall.
(32 foot max continuous run without sacrificing brightness)
Weight: 110g per 16.4 foot roll
All colors can be cut every 3 LEDs
All colors have 18 LEDs per foot

Electrical Specs:

Input Voltage: 12VDC