My 19 month old daughter has its felts for 4 months. Their size and width helps keep well for small, mine does not sink even if it hits hard with, and they do not dry out quickly because we live in Polynesia and it is very hot, they often stay open a while, we even sometimes misplaced caps several days and all still work very well. Last strong point, a coup d'damp sponge and a trace on the machine, it goes smoothly. Do not hesitate!