These magnets feature rare earth compounds combined with ferrite (anisotropic) to produce incredibly strong attraction/repulsion. They are encased in nickel jackets because the material itself is very brittle. They are provided with a nickel plated iron keeper. 10mm x 3mm.

Maximum Operating Temp: <80 deg C
Remanence: 1180 - 1220 Br (mT) /  11800-12200 Br (Ga)
Coercitivity: 860 - 915 kA/m / 10800 - 11500 Oe
Intrinsic Coercitivity: >955 kA/m / >12000 Oe
Maximum Energy Product: 263 - 279 kJ/m3 / 33 - 35 MGOe (BH)max
Currie Temperature: 310 - 370 deg C
Density: 7.4 g/cm3
Hardness (Hv): 560 - 580

WARNING: Getting a finger between these could result in a nasty pinch!