3/8" x 3/8" x 3/8" N38 Ni-Cu-Ni (Black) (Qty 10) [B00953.00953.00953.B3.010]  £2.98 - £4.25 

The 3/8" (9.53mm) cube is incredibly strong its size.  While catching some skin between two of these can create quite a pinch, they can be quite a bit of fun for adults.  They are quite versatile and make for some serious noticeboard/fridge magnets.
Dimensions:  3/8 x 3/8 x 3/8 thick (9.53 x 9.53 x 9.53mm)
Material:  NdFeB, Grade N38
Plating/Coating:  Black Ni (Nickel)
Magnetization Direction:  Thru Thickness
Weight:  6.48 g
Pull Force:  11.73 lbs (5.33 kg)
Surface Field:  4,680 Gauss
Core (BrMax):  12,600 Gauss
This product was added to our catalog on Thursday 31 May, 2007.
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 Base  £4.25 
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 95 - 99  £2.98 
 Above  £2.98