This set of cast-iron discs is extremely robust and perfectly suited to intensive training. Cast-iron discs are highly durable due to their composition, and remain dimensionally stable even under heavy loads. To ensure that they don't scratch easily, even under heavy use, these weights are made from solid cast iron. Suitable for weight training and cross-training, they are also ideal for fitness and rehabilitation. Sc SPORTS discs have a 31 mm bore and are therefore perfectly suited to all bars with a 30 mm diameter. Key features: choice of weights 4x2. 5kg, 4x5kg, 2x10kg or 2x15kg. Color: black. Bore: 31 mm (for bars with a diameter of 30 mm). Material: cast iron. To prevent rust, our weight discs are lightly oiled. The oil layer can be easily wiped off with a dry cloth.