I've had them for less than a week and several discs have either broken in half or chipped off. The magnet's power is really strong, but if you plan to use it for something that affects it more than gently, don't worry.
Power Up Your Projects With MIKEDE Cube Neodymium Magnets - Super Strong Rare Earth Magnets For Science And DIY
31 Review
MIKEDE Strong Neodymium Disc Magnets, 16 Pack Powerful Permanent Rare Earth Magnets With Double-Sided Adhesive, Fridge, DIY, Building, Scientific, Craft, And Office Magnets, 1.26 Inch D X 1/8 Inch H
40 Review
MIKEDE 8-Pack Powerful Neodymium Magnets With Double-Sided Adhesive - Ideal For Fridge, Crafts, DIY, Science, Building & Office Projects - Rare Earth Magnets For Strong Grip
39 Review
Powerful Neodymium Bar Magnets With Double-Sided Adhesive - Ideal For Home, Office & Scientific Uses - Pack Of 16 Magnets
40 Review