I will try to help, but disagee with the above post. I'll try to make it short and sweet (dont hold your breath, lol). I ordered 2 FC from here and when I got them I could notice a difference in the 2. I guess if you see them side by side, you can see the difference easily. FC have a more "rounded" look to their spikes, QC have a more pointed spike. HTH, not add to the confussion.