The Stihl tech rep we talked with for quite a while at this years open house said the 90 was on its way out, but would be a while before it was gone, He said he was pretty sure the others would be around a while. Get some Oregon Gator Magnum Super Twist. You won't use any other line after you try this stuff. It cuts like a sharp pair of scissors. That chord down the middle is Aramid fiber.