This is a ring magnet for water meters. The material is ferrite. The magnetization method is single-sided 4-pole. The specific specifications are 9.5mm outer diameter, 5.6mm inner diameter, 3.5mm height, and the weak magnetic surface is marked in white. There are many other water meter magnet sizes for you to choose, if you need any water meter magnet, we are happy to provide you with samples and offer you competitive price and best service,...