Material and Construction: Inner layer is solid cast iron, outer layer is a single-component vulcanized rubber (80–90 Shore hardness); the central 50/51mm standard bar hole diameter, with a built-in galvanized / stainless steel inner ring for anti-abrasion; the edge features three symmetrical triangular hand grip holes (not straight holes, to enhance grip).
Process: One-piece vulcanization molding is far superior to secondary gluing / thin rubber coating with cement; the rubber coating layer reduces vibration and noise, protects the floor, and prevents rust; the metal inner ring prevents the barbell bar from directly rubbing against the cast iron, preventing deformation.
Standard Specifications: For household / commercial use, mainstream sizes of 2.5, 5, 10, 15, 20, 25 kg; thickness increases with weight, with a uniform hole diameter of 50mm; custom options are available for professional venues, including 30kg + heavy-duty models.


