Resistant, it can be used for many children (even less careful). This is truly the perfect, I initiated my first and now it is with the CP is the little that wants to make as large and is delighted to use tirelessly for homework as his grandbrother! So 4 years she knows reproduce many uppercase letter that his brother had not acquired his age ... the whole collection is recommended, really I highly recommend! If the ink was not cleared immediately and dry, just wipe with a cloth slightly damp hop is like new! By cons use only erase markers (type weleda) ... excellent value!