.First-generation rubber magnetic whiteboard Its a classical rubber white panel. Due to shit magnetic left caused magnetism of back site greater than front side. Then, the magnetic weakness adsorb on front site. This is its defected..Second-generation rubber magnetic whiteboard It is a soft white panel and both two site no magnetism. So, it works very well while magnetic adsorbed. But it has no magnetism on the back side so it can not adsorb on the steel panel. That is its defected..Third-generation rubber magnetic whiteboard New both site white panel. (One site w/magnetism and another site no but magnetic adsorbed.) Its brand new magnetism panel. We used new composite magnetic, back site is soft magnetic and adsorbed on steel panel. Front site is steel plate and its magnetism is strong than classical magnetic whiteboard..Above this picture just for reference only.
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