Similar to the Tune-ups made for the Nine series Helmet but with different attachment, which is a breeze, these headphone speakers are excellent. Sound quality is good but not great, but that is not really important, especially considering the intended use. Compared to last year's Nine model it's obvious that there are some slight but marked improvements. The size of the speakers is larger than what I had expected. I have the original edition of the Nine Tune-ups for my Nine.Mx and these are a little larger than those ones. Using an Mp3 player set to a mid range volume the newer tune-ups are noticeably louder, so you'll actually be able to hear it over the wind noise when you're dropping a double black or airing over that 60-foot booter. Also the mute button has been redone into a sleeker little assembly with a nice clothing clip and the spring in the button is stronger so you aren't as likely to mute the sound if you inadvertently bump it. Only complaint is that the audio port for the cord on the headphones doesn't always line up great but this only takes a few seconds and some patience to find it in the headphone material and then your ready to rock....literally.