Dress your lunchbox up for seasons, favorite colors, pets and more! Can't decide on just one? Purchase several and mix and match each day of the week. • Remove magnets before washing lunchbox. • Made out of synthetic rubber certified safe of toxins (unlike PVC magnets) *If the magnets get wet it can cause the magnetic material to degrade and attach itself to the top of the lunchbox (which is magnetic). This can cause rusting. Making a thick paste of vinegar and baking soda, leaving it on the marks for at least an hour and then scrubbing it off and rinsing will clean the spots.