The Adafruit NeoPixel 332 LED-per-Meter Silicone Bead LED Strip is 0.5 meter long and 14mm wide. The strips come on a reel reel with three 10cm long wires connected to a JST SM 3-pin plug and a 3-pin socket on the other. The wires are even nicely color-coded: black for ground, green for signal, red for 5V DC power. You'll get SK6812 LEDs on these strips so you don't need an inline resistor and they work down to 3V logic+power (although they work best at 5V for sure). The strip is made of flexible PCB material and comes in a weatherproof sheathing. You can cut this stuff pretty easily with wire cutters.

These LEDs use up to 20 Amps max per meter - this strip is half that length so 10A max. The max rating is assuming all the LEDs are on full white and there's no voltage droop! That's not going to be realistic on such a thin flexible PCB - the copper just isn't thick enough to handle so much current without heating up! So basically don't set all the LEDs on at full brightness. Usually, the actual current for colorful design is less than 1/3 of the max current.

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