Strong magnets are brittle; strong magnet could pinch your fingers badly; if you allow two magnets attract together, it may cracks and the chips could hurt your eyes.
Material:N48 Neodymium Magnets
Dimension? Diameter 35mm x thickness 5mm,+-0.2mm (0.01 inch) tolerance
Br: 14000-14500 Gauss Bhmax: 48-52 MGOe Magnetization: axially magnetized / poles on Flat Ends
Max Operating Temperature: 80°C/176°F, Magnetic tensile force: ca.9kg