Interesting, because on the Sleek site, they only offer black or silver tips for the SA7 on the accessory page, but I received TWO pairs of silver tips, with different colour accents in the inside. Since I'm home now, it's difficult for me to tell which one is brighter, but I think the green tips sound more open and possibly emphasized upper mids. I do not remember what treble tips did what with the SA-6 unfortunately so I can't use that experience to assist me with these tips.
If I'm not mistaken, the silver ones with green interior come installed as stock.
I remember when I was evaluating the difference between treble ports I put on some songs from Adele (Set fire to the rain, Rolling in the deep) and Florence and the Machine (Dog days are over). The "plus treble" port made their vocals sound pretty agressive/harsh and ear-piercing. So I changed to "minus" and "neutral" and evaluated again until I found the one that was pleasant enough. In my case, I use the "neutral" ones.