Feature: 1. The magnet will not break during normal use, because the magnets are protected in the steel cup, which greatly improves the service life of the magnets. 2. This disc hole magnet with excellent corrosion resistance and scratch resistance, does not rust, and is very durable. 3. This hole magnet has has strong adsorption capacity for nickel, iron, steel, cobalt and other ferromagnetic elements. 4. The ultrathin magnet is easy to use and can be used in magnetic experiments, projects, and children's science. 5. Widely used in crafts, paper, charts, work, offices, classrooms, blackboards, refrigerators at home, etc. Specification: Item Type: Disc Hole Magnet Diameter: Approx. 15mm / 0.6inMaterial: Iron + magnetApplication: Used for magnetic experiments, projects, children's science Weight: Approx. 70g / 2.5oz. Package List: 10 Pack x Accessory (Total 30PCS)