Hi, my personal rule when using is to play safe. For example, the hook may say 2kg load, so I only hang stuff less than 1 kg. I hang my wedding frame, which is like 1m by 1m with 4 of the big sized hooks (4kg load). U can say i'm kiasu, but I don't want to drill my walls and I don't want my wedding frame to fall on my head too. Haha. One more thing, I clean wipe the area with soap water n wet cloth before I stick. And let the hooks stay there for a day before I hang. My experience is the hooks are great as no drilling is involve, but u cannot trust the recommended weight load. Hope this help