[jhautz]

I dont know either. I got them at the LHS in airplane section. They were Max brand. Looked like genaric packaging to me.

I see variation in the fit from plug to plug out of the same pack. On will fit nice and tight, and the next one will seem a little sloppy on the socket. One thing for sure though, its variation in the plug. If a plug fits tight, it fits tight in any socket. And if it fit sloppy, it fits sloppy in any socket. 4mm are so much better because they are alot longer. I actually like them better tha the 5.5mm. I feel alot of variation in the 5.5mm also. Not as bad as the 3.5, but its there.