The Vulcan OSO barbell collars appear to be everything and more as advertised on Vulcan's website. The first thing that sold me was the fact that they're aluminum (as opposed to plastic) and made in the USA as I am so tired of the junk made outside this country in you know where. In addition, the collars are very light weight and slip on/off the bar with relative ease. Based upon how well made they are, I believe these collars will serve me well in many years to come. A good example of 'You Get What You Pay For' and in this case, the collars were worth every penny!