Neodymium magnets. Be careful who you ship with when buying them from outside Canada. If customs knows you are importing neodymium magnets they slap you with an extra fee. When I ordered 40 dollars worth of magnets, the fee was 30$. Turned a good deal to a shit deal. Unpleasant surprise getting my package and having to go find some cash in my housecoat to pay the driver. UPS is bad.