The Oly Bar was designed for the dedicated weightlifter seeking only the best in premium barbell construction. Two copper sleeves and eight needle bearings provide the smooth and swift spin required for seamless lifts. On the Men's Olympic Weightlifting Bar (OBW1-86HC), we're using spring steel commonly used in shock-absorbing coiled springs for exceptional barbell whip. Mild knurling in the center with slightly more aggressive knurling where your hands would grip, provides a secure hold that keeps you connected to the bar through every phase of the movement at hand. The collars feature color-coded bands and inserts for easy identification: blue 20KG Men's Oly Bar and yellow 15KG Women's Oly Bar. Hard chrome coating ensures maximum rust and scratch resistance. Lifetime warranty.