I am very happy with this nail file and seller! (The product took a long time to come, after the first shipment that never arrived), it does its job, my nails are really soft and shiny. I do not think there was much difference between the sides 3 and 4, but if! That's impressive! So yes the environment is foam and we have to take care but personally, once the latter is kaput I recommend the same to me!
