i cannot speak for durability because it has only been a couple of weeks. they are CUTE and work exactly as advertised, are well-made. that is what the 5 stars are for. my kitty likes them but doesn't invest much energy with playing with them, which surprises me. they might be a little too big for her to carry around easily in her 4-month-old mouth. so, for the time being, i might try to anchor them to the wire in one if her tunnels because then they will squeak if she attacks them or if she brushes again the tunnel and makes it move. there are no loops on them, so i would have to make a loop. they are a quality item and i feel confident that their appeal will grow on the cat.