Actual product many very based on size and options selected.
Dilly Wax is the very best and longest-lasting fly floatant available. Specially formulated for use on poly yarn wing posts but also perfect for hackles, it liquefies between your fingers for easy application to your fly. It won't wash off in cold water, and once coated, the fly floats perfectly, time after time.
Also works great as a line/leader dressing. Easy to apply from a neat little tube.
Buy on-line or talk with a knowledgeable fly fishing specialist: