I'm also looking into a good cock ring for girth work other than the cable clamps. I'm interested in the black rubber cock rings DLD mentions. I've tried the Osbon ring before but even the largest size snapped within the first few uses and they sent me a new one and that one broke even quicker than the first. Your better off getting a good reliable rubber or silicon ring such as those gummy head rings or black rubber O rings DLD mentions.