Strong ring countersunk magnet for speaker magnet

Rare earth ring strong permanent speaker magnet  Tip: 1. Strong magnets should keep away from Ironware and some  easily magnetized iron products, such as monitors, bank cards, computers, televisions, mobile phones and other. 2. Strong magnets should be stored in a dry, heated environment, and need to use of plastic, wood, cardboard, foam to separated and wrapped. 3. Magnets might be interested in water meter ,electric meter, gas meter and some metering equipment exist some inaccurate affect (such as: if magnets placed near  the meter, the meter will slow down). Neodymium large ring more details as below: Material NdfeB Grade N38 Outer Diameter 66mm Inner Diameter 36mm Thickness…