It’s empty in here!
The look really good, my dog has them on all of her collars.
I am reviewing this 3 years (!) after I bought it - tardy I know, but was just looking through my zooplus order history to re-order Science plan and saw this and decided to review it. My dog still has this on his collar, still waterproof, still has the bit of paper in it rolled up with his home address on it, works well, good value.