Feature: Extremely strong Neodymium Magnet with up to 42 lbs pulling force on contact with 0.43" thick steel Magnet coated design: Ni+Cu+Ni Triple Layer Coated. The Best Coating Available, which Provides a Shiny and Rust Resistant Coated steel cup provides protection for the magnet and helps to prevent chipping or cracking. This Round Neodymium Magnet can be used fishing eyebolt, screws, hooks, fasteners, adsorption in warehouse or anywhere you need an incredibly strong magnet. High Quality: Magnet is neodymium iron boron (NbFeB) rare earth with Nickel-Copper-Nickel coated steel cup. Material: Magnet Residual magnetism :11.7 (T) Intrinsic coerciveness :285 (KA/m) Maximum magnetic energy product :965 (KJ/m3) Density :7.5 (g/cm3) Specification: 25 x 33 mm/1" x 1.3" Quantity:1 Pc, Cautions! 1.Dry the surface of fishing magnet after retrieving in the water. 2.Don't put the fishing magnet in fire or places with extremely high temperature,fishing magnets lose it magnetism at 608F Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand. Make sure you don't mind before you bid. 2. Please allow 1-5mm differences due to manual measurement. Package List: 1 PC Neodymium magnet.