Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
They are very well packaged. I've received the magnets in a envelope, inside with that kind of plastic with small air bubbles for protecting them. so all of the magnets have the correct shape, no one of them was broken. they are really strong. so if you want to build some magnetic experiments, it's interesting because you have 100 magnets for a cheap price.
I've been using the magnets for 8 hours, after that time, only two were broken. but was my fault, they are so strong that if one of them gets atracted suddenly by the others, if it's possible to break it in the impact. so.. carefull!
Check the size, maybe it's too small for what you are going to do.
if one magnet is not as strong as you need, just use two magnets together, with 100 magnets you can make enough couples :P
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