I am a childminder, so far to prevent a child from choking by swallowing inadvertently plug, the plugs drilled out ... but the risk of consumption exist ... and to prevent the corks do are lost also had to be very careful ... well, here they found the solution !!! The plugs are fixed to each other by a link !!! It's simple and so smart !!! And more than storage concerns, felts are together! And if you buy a set of markers per child, they are fighting over colors, each one has his own !!!