Light it up! Led's again

Im no expert with leds, had neons on my car a lonnnnnnng time ago. Could these just be cut down to size? I'm looking for a sound activated system. 
www.ebay.co.uk/itm/4pcs-7-Color-180-LED-Bulb-Under-Car-Glow-Neon-Light-Strip-Kit-Remote-Control-UK-/371049169077?pt=LH_DefaultDomain_3&hash=item56644100b5

I have not used that particular one before but I am 90% sure they could be from experience.

Thanks! for the sake of £16 I might get them anyway

Just do a bit of digging around as to the legalities of coloured lights. Briefly, if the source of the light is directly visible, you have to be very careful with red or blue, as these colours are 'reserved' for the emergency services.
I know your leds change colour, but you could have issues.
My leds are a very purpley blue, so I stuck them under the tank, hidden, so they bounce off the engine etc, but the light source can't be seen.

Yeah thats why i went for multi colour. No blue and red for me when riding down the road

Just keep the LEDs out of site.

I was close to buying that kit but didnt because it comes with that fob