My periodic table poster is now available! Another hip joint. This may or may not be cobalt-chrome alloy like my other hip joints. It's older and I don't know the history of what alloys were used for these devices, so eventually I'll need to test it. This one is nice because it came with the ball and plastic socket that is missing from my other hip joints. The plastic socket would have fit into one of the cups you can see listed under titanium. Source: eBay seller sushack Contributor: Theodore Gray Acquired: 28 April, 2004 Text Updated: 11 March, 2007 Price: $36 Size: 7" Purity: <60% Sample Group: Body Parts+Medical