Honestly, I don't know... I didn't ask when I bought it - I didn't even know G&L offerd different neck widths. It FEELS narrow to me - more so than my L2K - but it might not be G&L's most skinny neck. I wish I could tell you more, but if you were unhappy with it, we could trade back...
I'd still like to send you that gold metallic G&L ASAT for this... I don't know the size/number of the neck, but it's very narrow - much narrower than my L2K
