Size:Small/Medium Magnet Information: Magnetic Material: Grade 8 Ceramic Manufacturer's Rating: 4000 Gauss Surface Gauss: 1100 Gauss (each magnet) Penetration: 9" (23 cm) Polarity: North-Negative (-)

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Size:Small/Medium Magnet Information: Magnetic Material: Grade 8 Ceramic Manufacturer's Rating: 4000 Gauss Surface Gauss: 1100 Gauss (each magnet) Penetration: 9" (23 cm) Polarity: North-Negative (-)