【Product Description】 Size: Diameter 40mm This product is sold as a single piece. It will stick to a magnet, but the magnetic force is somewhat weak, so please be aware of this. ● Instant purchase is OK. ● Please feel free to consult with us if you have any preferred shipping methods. We will discuss any costs associated with changes on a case-by-case basis. ● There may be minor scratches or dirt. We perform inspections, but please refrain from purchasing if you are concerned about such details.