First of all sorry for took so long
Hmmm let me google a bit... http://www.ebay.es/itm/ws/eBayISAPI.dll ... 0665883910
They were EXACTLY like this ones.
Length: 20 mm.
Width: 10 mm.
Hole: 3,5 mm.
Thickness: 5 mm.
Weight: 7,2 gr.
Gauss: 3.700Strength: 3,6 kg.
Be VERY gentle with the magnets, because they will break into parts if you play with them doing some things like approaching one to other from maximum distance etc... if they come out for you in a pile, release them carefully ok?
Greetings and good luck!