This is a replacement module intended ONLY for use with the custom-fit High Fidelity Earplugs. It is not recommended for use with A-Series custom-fit or U-Series universal-fit IEMs.

64Audio's solid plugs do not feature the apex technology but offer up to -26dB of isolation. The solid plug is designed to be the same size and shape as the apex modules, so listeners can swap them in their High Fidelity Earplugs for different levels of isolation in different environments.