Indestructible!
Have had a few of these (and only because we've lost them, or our lab has buried them somewhere!). They're great to control frantic eating (our lab always thinks there's no tomorrow), and great for a treat. Even years later, he still gets so excited over this. We use the bigger Royal Canin kibble in ours, but it'll take smaller kibble too. Pack it in as tight as you can (you won't break this thing!), to make it more challenging!