N38 strength, nickel plated, quality magnet. Round 4″ (100mm)x 1.5″ (37mm). Very big and strong magnet! This is the biggest we sell. Plan how to handle it. Safety first! Your TV and computers will be effected in whole room, but not damaged. For reserchers and professionals. It can lift tons. Once you allow stuck to heavy iron, good luck! It can be used in positioning vehicles in industry. 10 such a magnets in two assembles could be used to achive 7 feet electrical arc according to American patent with only 7 -10 kV. Unknown phenomenon. Other sizes available.
Now that’s good times! (Thanks, Chris!)