These magnets are used world wide for their strength in all kinds of crafts.
These discs, like all of our magnets, are of the highest quality materials and are fully licensed neodymium products. Neodymium magnets are the most permanent magnets available. They do not require a "keeper", nor will they lose any appreciable strength during your lifetime...no matter what your age! They are hands down, the strongest and most amazing magnets you can buy.

Dimensions: 2mm dia. x 1mm thick - Aprox. 1/16" x 1/32"
Tolerances: ±0.004" x ±0.004"
Plating/Coating: Ni-Cu-Ni (Nickel)
Magnetization Direction: Axial (Poles on Flat Ends)
Weight: 0.000416 oz. (0.0118 g)
Pull Force, Case 1: 0.07 lbs
Pull Force, Case 2: 0.11 lbs
Surface Field: 5233 Gauss
Max Operating Temp: 176ºF (80ºC)
Brmax: 14,800 Gauss
BHmax: 42 MGOe

WARNING: KEEP OUT OF REACH OF CHILDREN. THIS IS NOT A TOY. DO NOT INGEST OR INHALE. SEEK IMMEDIATE MEDICAL ATTENTION IF MAGNET(S) ARE SWALLOWED OR INHALED. MAGNETS ARE BRITTLE. BROKEN MAGNETS ARE SHARP. MAGNETIC MEDIA AND ELECTRONIC EQUIPMENT HAZARD. KEEP AWAY FROM PACEMAKERS AND INTERNAL MEDICAL DEVICES.

Thank you for looking!!!