Neodymium magnets are an alloy of neodymium iron and boron. They have very high energy and are more powerful for their size than any other magnet material. You will find them in many industrial and household products and are ideal for crafting.
eBay
20x10x4mm N35 Super Strong Neodymium Magnet Blcok NdfeB Powerful Permanent Magnetic imanes Refrigerator Magnets 20*10*4mm
Aliexpress UK
Samarium Cobalt. Grade: N38. Neodymium Blocks. Neodymium Disks / Rods. Neodymium Cubes. Neodymium Rings. Neodymium Spheres. Neodymium - Self Adhesive.
eBay
4x1.5mm Powerful Neodymium Magnet N35 NdfeB Permanent Magnetic imanes Round Super Strong Fridge Magnets DIY
Aliexpress UK
11Kg (11000g). 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
15x4mm Powerful Neodymium Magnet N35 NdfeB Permanent Magnetic imanes Round Super Strong Fridge Magnets DIY
Aliexpress UK
Samarium Cobalt. Grade: N35. Neodymium Blocks. Neodymium Disks / Rods. Neodymium Cubes. Neodymium Rings. Neodymium Spheres. Neodymium - Self Adhesive.
eBay
20x3mm N35 Super Strong Neodymium Magnet Round With Double-sided Adhesive NdfeB Powerful Permanent imans Refrigerator Magnets
Aliexpress UK
Magnets Type: Neodymium. Perfect for sticking notes on fridge doors.Great for do-it-yourself projects. Super strong Rare-Earth magnets,once they get stuck with each other,they are hard to break apart.
eBay
40x20x3mm Block Powerful Strong Magnetic Magnets 40*20*3 Quadrate Magnet With Tape For Fridge, DIY, Scientific Craft 40x20x3
Aliexpress UK
Material: neodymium iron boron+magnet. i4.14e8QwKAQwKAI9" style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px; margin: 0px; padding: 0px; height: 8688.33px; position: absolute; top: 0px; visibility: hidden; width: 1211.98px; z-index: -1;">.
eBay
5x2mm Refrigerator Magnets 5x2mm Permanent Small Round Super Powerful Strong Magnetic Magnets Disc 5*2mm
Aliexpress UK
Each magnet is made with neodymium, a powerful magnetic material known for its strength and durability. Neodymium Magnets, Extra Strong Rare Earth Magnets for Fridge Whiteboard Office Noticeboard Crafts Kitchen Map, Small Mini Round Powerful Permanent N52 Grade Magnet Heavy Duty, 12×16mm, 12PCS.
eBay
40x10x2mm Sheet Powerful Magnets 40*10*2 Strong Block Magnets For Fridge DIY Building Scientific Craft Education 40x10x2
Aliexpress UK
【Strong Magnetic Force】Neodymium ring magnets are composed of strong round magnets and steel sleeves. They are small in size but have amazing adsorption force. Under ideal conditions, the vertical pulling force can reach up to 10kg(20lbs).
eBay
20x20mm Powerful Neodymium Magnet N35 NdfeB Permanent Magnetic imanes Round Super Strong Fridge Magnets DIY
Aliexpress UK