Length (Length): 100 mm  accuracy (tolerance) +2.5%/-2.5% 
Width: 20 mm  accuracy (tolerance) +2.5%/-2.5% 
Thickness: 6 mm  accuracy (tolerance) +2.5%/-2.5% 
Material: Ferrite
Weight: 55 g.

Instantly recognizable, these bar magnets are great for teaching children about physics and for fun science projects. With each magnet having a north pole on one end and the south pole on the other, the two magnets included in each pack can be used to display the attracting and repelling effects of magnets.