XMark's 7' Olympic bar with brass bushing, 28mm grip, medium knurling and a hefty 700 lb. weight capacity is built solid and priced right. The XMark 7' Olympic bar has black manganese phosphate on the shaft. Manganese phosphate coatings are the hardest, while providing unbeatable corrosion and abrasion protection. Uncompromising quality and affordability are what you have come to expect and receive from XMark. Your XMark 7' Olympic Bar is an investment. As with all black manganese phosphate shafts, take a couple of minutes to protect your investment by wiping down your bar regularly with a light coat of a 3-in-1 oil.