Those things are with their 10 mm edge length really tiny, but you should not let täuchen .. if 2 of them can be found (going from a distance of 5 cm all by itself .. :-) you can not get them almost apart. I have 3 of them by means of 2K adhesive together (Super Magnet) and adhered to a LED tube. The whole now adheres firmly and reliably in my steel wall pool.