These phono/RCA/chinch/banana stereo pair gets the job done in the studio. I haven't tested them yet on stage, but probably you should stick to something sturdier.
Having said that, if you want to have a good and cheap instrument stereo cable (for a keyboard, a couple of guitars, a groovebox, etc), just add a couple of the ssnake 1820 adapters () and presto!
Highly recommended as one of the most down-to-earth building blocks of the home studio.