The Livepro polyurethane two-color sport barbell features an alloy steel core embryo with a 13cm diameter and a 7mm thickness. This robust design ensures both hardness and stability. The barbells exterior is wrapped in high-quality polyurethane material, ranging from 21.5mm to 54.3mm in thickness. When dropped, this barbell remains silent and wont damage the floor. Its also waterproof and wear-resistant, making it suitable for long-term use. Notably, the barbell boasts a unique design with exquisite color matching and adheres to the IWF standard. In rigorous testing, it endured 30,000 drops (excluding the 5kg variant) from a standard height without deformation or damage. Additionally, each color corresponds to a different weight, allowing for easy identification during workouts1.Technical Specifications:Brand: LiveproColor Options: Gray-black, yellow-black, green-black, blue-black, red-blackMaterial: Alloy steel core wrapped in polyurethaneAperture: 50.5mmBell Diameter: 45cmThickness Options: 21.5mm, 30.7mm, 42.5mm, 49.4mm, 54.3mmWeight Range: 5-25kg (in 5kg increments)Features:Weight Accuracy: Each barbell is precisely calculated with a weight tolerance of +/- 1%.High-Quality Polyurethane: Corrosion-resistant, heat-resistant, and odor-free. Outperforms traditional rubber dumbbells.Alloy Steel Core: Provides both aesthetics and stability.Thinner Ring Piece: Ensures strength and stabilitySPECIFICATIONS Color Gray-black/yellow-black/green-black /blue-black/red-black Material Alloy steel blank, wrapped in a polyurethane layer Aperture 50.5mm Bell diameter 45cm Thickness 21.5/30.7/42.5/49.4/54.3mm Weight range 5-25kg (5kg increments)