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wheel hub competitive weight lifting piece, surface casting polyurethane elastomer, environment-friendly and tasteless he product has good elasticity, wear resistance and high strength; hole diameter: 52mm, diameter: 450mm, thickness: 23mm, dermatoglyphic surface design the product conforms to the ergonomic design, which is more scientific in use and protects against injury during use the bare metal is treated by electroplating, which is not easy to rust, and is skid resistant and anti-corrosion as a professional manufacturer of sports equipment, we have rich production experience and can provide customized services. you can contact our customer service before placing an order.syi