Use to glue on coral frags you would like to grow on walls of tanks instead of gluing to aquarium glass or acrylic.
Just glue the coral to one side of the cap and use the other magnet cap to hold the piece.
Caps are 3D printed plastic PLA.
Magnets are N52 Epoxy Coated and encased in a watertight seal.
2x LRC 20x3mm Magnetic Coral Caps