They are made with super-strong 42 Crmo steel with 210k PSI Tensile Steel Strength for maximum weight capacity and safety. This premium barbell is equipped with 4 needle bearings to ensure the perfect spin for the sleeves which gives the much longer lifespan of the bar and super comfortable lifting. 1500LB Premium Barbell: Specifications: Dimension: 2.2 meters IWF standard barbell Bar Weight: 20KG Load Capacity: 1500LB/680KG Material: Strengthened 42 Crmo alloy steel Sharft Coating: Premium Black Zinc finish for long-lasting performance Sharft Diameter: 28mm Sleeve Coating: Hardened Chrome Knurl Double knurl marks, perfect for a powerlifter. No center knurl. Bearing 8 needle bearings Sharft Length Collar-to-collar length 131 cm 700LB Elite Barbell: Specifications: Dimension: 2.2 meters IWF standard barbell Bar Weight: 20KG Load Capacity: 700LB/317KG Material: Strengthened 42 Crmo alloy steel Sharft Coating: Premium Hard Chrome finish for long-lasting performance Sharft Diameter: 28mm Sleeve Coating: Hardened Chrome Knurl Double knurl marks, perfect for a powerlifter. No center knurl. Bearing 4 needle bearings Sharft Length Collar-to-collar length 131 cm