MAGNETS COATED - Ni+Cu+Ni Triple Layer Coated. The Best Coating Available, which Provides a Shiny and Rust Resistant Protection for the Magnets. POWERFUL MAGNETS - Made of Strongest Magnetic Material! Strong Holding Power, Holding Power is not Less than 18 lb. per Magnet with Direct Touch and Direct Pull. It has a tensile force even larger than a 3 inch diameter ferrite magnet. DIY PROJECTS & SCIENCE EXPERIMENTS - Refrigerator Magnets, Shower Door, Work or Office, Scientific Purposes, Arts and Crafts or School Classroom. QUALITY - Made under ISO 9001 Quality Systems. The Highest Quality Available! 30 Days Money Back ! VARIOUS SIZES - If you need to buy more sizes of magnets (e. g. 3inch, 4inch, 5inch, etc. ), please search for DIYMAG brand. DIYMAG provides professional design and consultation service according to customers’ requirements. DIYMAG Neodymium DISC Magnets with Double-sided Adhesive - 32mm x 3mm (50 PCS)Rare earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These 32mm diameter Neodymium disc magnets produce an astonishing pull of 18lb and every magnet has a triple coating of nickel, copper and nickel again to prevent against corrosion. These disc magnets are 1.26 inch (32mm) diameter and 0.08 inch (2mm) thick. They are magnetized through the thickness. They are composed of grade 42 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Maximum working temperature is 176 F (80 C). Our Neodymium magnets are commonly used in creative applications such as models and theatre design, furniture making, exhibition stands and packaging. They also have many uses in engineering and manufacturing where compact size and maximum strength are required. What's more, because of their resistance to demagnetisation they are ideal for creating a shock-absorbing or damping effect when used to repel other magnets. Holding Force detection method: We use the automatic machinery in pull off speed 80mm/min to test products by attracting on an 10mm thick steel plate.Warning:1. Keep away from pacemakers.2. Powerful magnets can hurt your fingers.3. Not for children, parental supervision required.4. All magnets may chip and shatter, but if used correctly can last a lifetime.5. If damaged please dispose of completely. Shards are still magnetized and if swallowed can inflict serious damage.