... YNN Ceramic Balls are ideal choice as grinding mediums.1. BRAND:YNN2.MaterialYttria stabilizedZirconium yttria stabilized Dioxide3.CertificateISO9001,ISO140014.Density: ≥5 ... wearproof,Extremely long useful time, Improve efficiency etc. 6. Applications1)wear-resistant, corrosion-resistant products: paints, textiles, paints, printing and dyeing ...