NAF PROFEET Rock Hard is a first-class hoof hardener created to protect hooves, strengthen soles & disinfect frogs which are prone to fungal & bacterial attacks. NAF PROFEET Rock Hard is a source of naturally bio-available sulphur, which provides maximum hoof horn integrity. Directions for use: Apply daily to the frog & sole with the brush provided. Paint around the lower half of the hoof, allowing the fluid to seep into the nail holes & splits. Replace lid after use & store in a dry place.