The SMSN0737 SPHERE neodymium magnet is made from high performance N42 NdFeB, with Nickel coating. The dimension of this item is 1/8″ diameter, with tolerance of ±0.004″. The weight of this super strong neodymium magnet is 0.00025 lbs. It can pull up to 0.41 lbs steel. And the surface field is up to 8815 gauss.SMSN0737 Neodymium SPHERE Magnet Safety TipsThe smsn0737 neodymium sphere magnet is so small that Children could swallow it easily. If several magnets are swallowed, they could get stuck in the intestine and cause perilous complications.Magnets are not toys. Make sure that children do not play with the smsn0737 neodymium sphere magnet.The smsn0737 neodymium sphere magnet could also be used as like push pins and fridge magnets. keep track of all rare earth magnets in a home, not just those located in toys.