5in – Titanium Bronze, for my 5 years old grand son. It can be detached, which I prefer. fx5234 The Audio-Technica ATH-M50X not only sound better but they are also cheaper and better built. There is hardly any break in period necessary, perhaps just a few days. fx5234 However, the measurement as the product descript on the measurement chart is accurate enough for you to make a selection. fx5234 Both music and spoken sounds are good quality and sound clean. I returned it and ordered another pad that is also advertised to fit both standard and Olympic bars. Perhaps, this is because the foam is denser. fx5234 My husband spent some time searching for a video to help & was able to find one that better explained the locking mechanism & how to detach the rack from the hitch. I am not affiliated with Thule in any way whatsoever but I would be happy to answer any questions that I can in regards to these bars.
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