Designed to aid in the protection of either a baby anemone, mushroom , or leather coral. Will allow a mushroom or leather coral to naturally attach to a plug, disk or rubble. Prevents your mushroom from being pulled away by the currents within your tank and accidentally sucked away by either your overflow or filtration system. Size - Fits up to a 2" Inch Frag disk, tile or plug. These are 3D Printed from Reef Safe PETG Plastics. Each shroom Box has a matching locking lid, just align the grooves, and the lid snaps securely into place. Custom made plugs or discs to match are available and sold separately. You may choose from several colors and styles available. We have them in both round as well as our new square shape to accommodate frag tiles, not just discs, as well as magnetic versions as well. Magnets have been tested to hold on up to 1/2" glass thickness. If a stronger magnet is desired, we can also custom make them in any shape or size. *Does not include disc or Tile, we sell them separately, please see our other listing to find matching discs or plugs to fit your application if needed.