Usually surprise is an issue--they can jump out of your hands and snap together from a surprising distance before you realize what is happening. They are strong enough that they can fly into each other or to a piece of iron or steel with such velocity that they can break and send sharp 'shrapnel' flying about!
eBay
30x5-6mm Super Strong Magnet N35 Round With Holes Magnetic NdFeB Neodymium Magnet Powerful Disc imanes Refrigerator Magnets
Aliexpress UK
10mm diameter x 5mm thick with a 3.2mm diameter countersunk hole for fixing +/-0.1mm tolerance Each magnet can support 1.4kg pull vertically from the magnetic face when in flush contact with a mild steel surface Resistant to corrosion and demagnetisation Can be fixed in place with our Samarium cobalt is a type of rare-earth magnet that has the ability to withstand and operate in high temperatures, however they are not as powerful as super-strong Neodymium magnets. Because of their high maximum operating temperature they are commonly used in applications such as motors and electric motors, turbo machinery and sensors.
eBay
Super Strong Magnet N35 block Magnetic NdFeB Powerful Neodymium Magnet imanes Refrigerator Magnets 30x10x4 30x20x10
Aliexpress UK
These Neodymium disc magnets may be small but they have an astonishing pull of 1.1kg. Every magnet is coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish.
eBay
Creative Refrigerator Magnet Sticker Cute Zhaocai Cat Decoration Magnet Sticker Sticky Note Cute Refrigerator Magnet Sticker
Aliexpress UK
Upgrade your projects with these high-quality N52 neodymium magnets! Material: N52 Grade Neodymium. Made from the highest grade N52 neodymium, ensuring maximum strength and durability. 2-200pcs x N52 Neodymium Magnets (10mm x 1mm).
eBay
Disk Ferrite Magnet 8x2 8x3 10x2 10x3 10x5 12x3 15x3 20x3 20x4 20x10x5 mm Speaker magne Permanent magnet Ceramic Magnets
Aliexpress UK
eBay
8x2mm Super Powerful Round Magnet Neodymium Magnet NdfeB N35 Strong Permanent Magnetic imanes Refrigerator Magnet
Aliexpress UK
Magnet Magnetic Patch Disc Iron Absorbing Stone Round Neodymium Magnetic Steel Small Magnet N35 and N52. These shapes are then electroplated with nickel to prevent corrosion. Depending on their size and shape if you allow neodymium magnets to crash together the force may shatter them.
eBay
8/10/12/15/18/20x3 Strong Magnet Countersunk Round NdFeB Neodymium Magnet Powerful Rare Earth Permanent Fridge Magnets with hole
Aliexpress UK
5mm x 2mm N52 Neodymium Disc Magnets ?. Super Strong ?. Strong Magnets 20x10x2 mm N52 grade neodymium block small thin rectangle magnet. Strongest N52 Magnets Strong Various Size 2-30mm DIY, Craft,Small Disc Magnet.
eBay
6x2mm Super Powerful Round Magnet Neodymium Magnet NdfeB N35 Strong Permanent Magnetic imanes Refrigerator Magnet
Aliexpress UK
These 10mm neodymium sphere magnets combine exceptional strength with a smooth, durable design. Material: Neodymium. ⚠️ Safety Notice – Handle with Care. They are not toys. Where a compact, strong magnetic hold is required, these sphere magnets excel.
eBay
Super Powerful Round Magnet with holes Neodymium Magnet NdfeB N35 Strong Permanent Magnetic imanes Refrigerator Magnet
Aliexpress UK