Ettore rubber is the best.
I forgot they do Ettore Soren rubber to fit Sorbo channels so you CAN get Ettore rubber that fits the Quicksilver channel!
Check SteveO’s YouTube and u will find a video on “ Ettore Soren rubber for Sorbo channels” If you check the comments SteveO states that the Ettore Soren is the best quality but the Black Diamond represents better value for money overall. Hope this helps.