144 individually-controllable LED pixels on a flexible PCB. It's completely out of control and ready for you to blink. and an extra heavy flex PCB in white & Black version.
the digitally-addressable type of LED strip. You can set the color of each LED's red, green and blue component with 8-bit PWM precision
(so 24-bit color per pixel). The LEDs are controlled by shift-registers that are chained up and down the strip so you can shorten or lengthen
the strip. Only 1 digital out pin is required to send data. The PWM is built into each LED-chip so once you set the color you can stop talking to
the strip and it will continue to PWM all the LEDs for you.
regarding it's flexible PCB material, you can cut this stuff pretty easily with wire cutters, there are cut-lines every LED. Solder to the 0.1" copper pads
you can also connect strips together to make them longer, just watch how much current you need
Datasheet