From the Airflo website:
The 14′ Salmon and Steelhead Polyleaders offer great turn over for bulky and heavy flies. Available in 6 different sink rates from floating right through to Extra super fast sinking, these extra strong polyleaders provide complete depth control which is so often essential when fishing for salmon and steelhead.
The 14ft polyleaders are ideal for fishing bombers with the slow and fast sinking polyleaders allowing you to bed your flies down, avoiding drag from a floating line. The EX.Fast sinking leader gets the flies as deep as possible. We recommend a maximum of 24lb tippet strength.