Double Side Magnet Fishing,combined 500kg Pulling Force,75mm Diameter, Double Si The large neodymium magnets are extremely strong, and must be handled with care to avoid personal injury and damage to the magnets. Fingers and other body parts can get severely pinched between two attracting magnets. It is easy broken,please be careful.Strong magnetic with 304 steel and neodymium magnet.Neodymium magnets are brittle, and can peel, crack or shatter if allowed to slam together.Great for recovering keys down a drain or overboard a boat.Strong magnets should keep away from Ironware and some easily magnetized iron products, such as monitors, bank cards, computers, televisions, mobile phones and other.