I bought some several years ago and have used them on several projects. They came from a place that included paperwork with severe instructions about not letting them get near each other and cautions for using them in general. I didn't expect that. It was like I was buying them from a scientific supply company. Mine are a little over an inch in diameter and very thin. People on-line complained that they had problems with the magnetics breaking or shattering though I've never had that experience. I bought them around 2016. Though I've got a few left, most have been used in the construction of my Dutch Chest, Specialty plane suitcase and Work caddy.