Super strong magnets are made of strong neodymium iron boron alloy (NdFeb). Also available in a stylish nickel finish (Ni-Cu-Ni) and an attractive silver finish. Neodymium magnets have a maximum operating temperature of 176F. magnets are plated with three layers of Ni+Cu+Ni. Our magnets are coated with for excellent corrosion resistance, with a bright and surface that will not rust and scratch. neodymium magnets are great for DIY craft projects, science project magnets. Use neodymium magnets for anything including finding studs on walls, fixing, lifting, hanging objects, various projects and presentations, education. Square magnets are also security tag removal tools. Length: 25mm/0.98 inch, Width: 25mm/0.98 inch, Thickness: 25mm/0.98 inch; Tolerance: 2mm x 2mm. size: 25 x 25 x 25mm Material: NdFeB colour: silver Package Contents: 1 x Square magnet Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.