Magnets of this strength can be used on glass boards with the utmost caution if you are looking for magnets that are very strong

If your marker is dried out

these magnets are not strong enough for a glass board - choose the "power magnets" category instead

Buy strong tactics magnets for your tactics board

in strength for magnetic glass boards

Møtrik M4 - Stålmøtrik FZB, 10-pak BF Tier1 Magnets of this strength canPack of 10 steel nuts with M4 thread. You get a package of 10 pieces. Thread: M4 Model: DIN 934 8 FZB Package: 10 pieces. What does FZB mean? It is an electro galvanization of the nuts (electro galvanizing), which extends their durability and makes them more resistant to rust. However, as they are not acid free, they are not suitable for outdoor use. Good for use with magnets with external thread. Usually you can only buy nuts in large packages of 100