http://www.flyworld.com.au/view/20120221145037/
"Developed for the expert competition reservoir buzzer or chironomid anglers in the United Kingdom who need to get their flies down deep and fast. Fastest and most durable sinking lines in the world. Gets flies down deep and generates high line speed. Created for a 7 weight fly rod, but can be used on 5 to 8 weight".
Chris.
http://www.flyworld.com.au
9371 5156