I have used the pet tech magnets in my gecko cages in the past and only had one mishap that did make me discontinue there use though they are seen as safe. One of my females fruitloop the crested some how got her tail caught between the magnets front and the cage. I got her out when I heard her sqeaking, but her tail was pretty mangled though it has since healed. I also believe another male was injured the same way though I didn't see or hear it. I just found him the next day with a suspicious looking mangked tail as well that even though it healed will never look right again. I would be afraid a snake could easily make the same mistake, but these are only my observations and in 7 years the only injuries I have ever seen.