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How can I stick the focal length on a glass blackboard without magnetism? Can I use a magnetic buckle?
You ask how to stick the teaching aid on the glass blackboard without magnetism? Can you use a magnetic buckle? This kind of glass blackboard can't be used to attach teaching AIDS with magnetic buttons.

Magnetic buckles can only be connected to magnetic objects, but not to non-magnetic objects, so you can't use magnetic buckles to stick teaching AIDS.

Mask paper tape can be used to attach teaching AIDS, because it has the characteristics of high temperature resistance, good chemical solvent resistance, strong adhesion, soft clothes, tearing without leaving any residual glue, and will not leave traces after being attached to teaching AIDS.