3/4 x 1/8 Inch Neodymium Ring Magnets with Countersink
ONE lot of 4 Magnets.  2 magnets will be NORTH POLE on the COUNTERSUNK SIDE and 2 Magnets will be SOUTH POLE on the COUNTERSUNK SIDE conditions. These discs are axially magnetized, so the strong North/South poles are in the center of the flat sides. That makes them easier to stack into a cylinder than to connect side by side. The metal coating is durable, but ALL Neodymium magnets can chip or shatter. If used gently, these magnets can serve you for a lifetime.