The out cover specially is not of good quality. One of the packs did have a broken button where the battery door opens. I decided to just test it out a little. I don?t have any issues with cheap metals or allergies so I can?t help there, but if you want to make these work for a long while, just put a dab of really strong glue. The peg above the 2x35 is unusable so I have to store my 2x5 somewhere else. The Spigen case actually scratched my AirPods case in two places (see photos). I am blown away away. Since the product page was a bit unclear to me I am going to explain the interface a bit. It will fit tight in the 3 5/8" but you cannot stack them and that was the purpose of getting these stackable wine bottle racks! Since there are three hangers, the organizer hangs nicely.