Audiological devices for use with hearing aids, namely, ear molds, custom-fit ear molds, earpieces, custom-fit earpieces; hearing instrument acoustic coupler; ear filters for hearing protection; custom-fit ear plugs used for hearing aids; ear plugs used for hearing aids; custom-fit ear plugs used for protection of hearing; ear plugs used for protection of hearing; hearing aids; digital hearing aids; electric hearing aids; electrical hearing aids; hearing aids for the deaf; cast material for hearing aids; molds for hearing aids; wireless transmitters and receivers for use with hearing aids; sound processors adapted for use with prosthetic hearing devices; assistive listening device for the hearing impaired; audiological devices, namely, hearing protectors that may also reproduce or transmit sound; noise filters used for noise reduction in ear plugs; filters used in custom and universal hearing protection products; custom-fit ear plugs for noise reduction; ear plugs for noise reduction; ear plugs for soundproofing