Bronze is a versatile and commonly used material for bushings because it comes in many alloys and compositions. Bronze sleeve bushings or bronze bearings are hard and strong, as opposed to brass bushings, which are softer and more easily deform. Thus, bronze bushings have longer lifespans than brass bushing sleeves. They resist shock and impact, wear and corrosion. They require an external lubricant, for example grease or oil, at installation and during operation to reduce friction and wear.