mine popped off but still got it to work [SEP] maybe i m the only one who this happened to but the first use my larger piece popped off with very little force i was able to get it back on and squeeze the sides to help it stay in i do actually like this product and it stays cold for a while after taking it out of the freezer ever since putting it back in it hasn t come off i also like the way it feels for facial massage and lymphatic drainage