• Dimensions: 1/4" diameter
• Tolerances: ±0.004"
• Material: NdFeB, Grade N42
• Plating/Coating: Ni-Cu-Black Ni (Black Nickel)
• Weight: 0.035 oz (1.01 g)
• Pull Force, Case 1: 1.63 lbs
• Pull Force, Case 2: 1.96 lbs
• Surface Field: 8815 Gauss
• Max Operating Temp: 176ºF (80ºC)
• Brmax: 13,200 Gauss
• BHmax: 42 MGOe

These are exactly the same as our S4 spheres except that they are plated with black nickel, which gives them a dark charcoal color instead of the standard shiny silver finish of nickel plating. They can be used alone, or combined with our standard silver S4 spheres and other shapes to make interesting magnetic jewelry.

	Click here for a depiction of the magnetic field.
	View B-H curves for this magnet.