Those could work but it all depends on where and how you attached the magnets, and what magnets they are. Neodymium and rare earth work the best because they are strong and can hold, but if they are on the inside of your prop and under your armor they always have about an inch of foam to prevent them from sticking too much so that they can be separated easily. Velcro could also work, but I don't like to have things that shouldn't be there poking out the side of my props... :b