HENRY'S SINKET WETTING AGENTFormulated for application to nymphs and sub-surface flies to help them break surface tension and sink rapidly. Hydrophilic properties attract water causing your fly to roll along the bottom as naturally as a dislodged nymph. Biodegradable. 1/2 oz.PRODUCT TIP:Work the wetting agent into the body of the fly. This will make sure that the fly will break the surface tension and head to the bottom like a stone.