In the sport of Weightlifting the only required equipment is a barbell and plates. The barbell is the implement used to perform the lifts and as such must be built and designed with that purpose in mind. Specifications for a men’s bar are that it is 28mm in diameter of the shaft, 20kg in overall weight, and contains a single knurl mark and center knurling. Women’s bars although the same length in between the sleeves are 25mm in diameter, 15kg in overall weight, and contain no center knurl. Differences in knurling depth create a passive or more aggressive feel to the grip. Polishes or coatings add aesthetics and anti-corrosion properties. Weightlifting bars in particular are assembled using needle bearings in place of the more common brass bushing. Bearings enable the shaft to spin freely inside of the sleeves and allow the lifter to have a smooth turnover as the bar is caught on the shoulders or overhead. These bars are also made from specific steel to allow the bar to flex or oscillate and still return and remain straight. Many manufacturers produce high level Weightlifting bars and choice usually comes down to personal preference on how the bar feels to the lifter. Quality barbells run in the $700-$1000 range and should last through years of hard lifting and abuse.