where it has to be able to withstand extra wind and weather when the containers are moved around in a heavy-handed way with many blows and bumps

This means that the magnet does not break easily when you do experiments with attraction

binders with magnetic closure etc

As with most magnets

These are with pozidrive cross notches (for Phillips screwdrivers)

Ludo magnet Maxi, Hvid BF Tier1 where it has to beWhite Ludo MAXI magnet. Extremely strong magnet. Strength: 2. 5 kg. Width: 2. 5 cm. Height: 2. 9 cm. Color: White Magnet shaped as Ludo pieces. Made with white plastic and a powerful neodymium magnet at the bottom. This magnet is strong enouch for magnetic glass boards. This item is sold separately info on bulk discount to the right. Please note: Strong magnets are not suitable for small children. Made by Magnetpartner.