Drennan Sub Surface Green nylon is one of the most popular sub surface monos.
This tippet material is ideal when you wish to get an ideal flow onto the water with a small dry fly.
Code: DSN1
50m spool
Weight/Diameter: 3lb (0.18mm), 4lb (0.20mm), 5lb (0.22mm), 6lb (25mm), 8lb (0.275mm), 10lb (0.30mm). 40m Spool - 12lb (0.325mm)