Product name:Paint Mixing Balls Material:316 Stainless Steel Specifications:225 PCS Product size:4mm/apr. 0.16” These nail polish mixing balls are manufactured from stainless steel with precise geometry and a fine surface finish. They are characterised by high strength, good hardness and wear resistance, as well as rust-proof and anti-corrosion properties. They are also reusable and durable, offering a long lifespan