The 1 are small magnets with a diameter of 6 mm. They are neodymium magnets, so their magnetic force is strong. Please refer to the website links for detailed features and prices.

1) The magnets I use.
Website：Product page
Brand：DAISO
Name：Super strong magnets mini / 8 pieces
Number：4549131156621
Size：DIA – Φ6 mm, T – 3 mm
Material：Neodymium magnet
Feature：Small but strong magnetic force.

2) Magnets similar to the 1.
Website：Amazon