I believe our small one holds 15 feet of .095 line, we run a small one on the Stihl 80's a large one on the 90R and our shindawia 246? runs the small one.
You won't regret spending the money on the head, they are the cat's azz.
We've run the Stihl heads for years, but the speed feed is the only way to go.
Indian Springs Farm
Missouri Commercial Applicator
Bad Boy ZTR Mowers
Lightning Z 60" 26 HP LC Kawasaki
Diesel AOS 60" 35 HP CAT Diesel
Stihl Trimmers, FS 74, 80(3) 90R
Shindawia 242 trimmer
Kubota push mowers
JD Farm Equipment