brass rainbow 

Also known as "Brass Knuckles".

And then I hit him with a left brass rainbow, and down he went.

brass rainbow by drugbunny May 22, 2016

rainbow bass 

the six string fretless bass owned by primus frontman les claypool.it is made from different woods (walnut, curly maple, padauk, purple heart, ebony and cocobolo) these are in a striped pattern which is why it is called the rainbow bass.it was made by carl thompson basses and cost $10,000.

if i had 10 grand i would buy a bass equal in awsomness to the rainbow bass

rainbow bass by primussucks June 24, 2005