1.size:Dia 20mm,30mm,40mm 2.High quality for plastic and magnet 3, free for sample 4.any demands are available Product details:1.Size: 20mm, 30mm, 40mm 2.Color: black, white, green, red, yellow and blue 3.Packaging: blister card/pvc box4.Blister card: 20mm 6pcs/card, 30mm 5pcs/card, 40mm 4pcs/card5.OEM welcomed. LESS MOQ6.High Quality, Shiny Surface, Strong Magnets About our factory:1. Our ...