According to my sources, this is only the 2nd Paul Comp single speed tandem crankset made. Back in 2007 or so, Paul Price reverse threaded the cranks for me for a show bike. These cranks and bb's were installed on a track tandem I had built and it was ridden no more than 12 laps at Major Taylor Velodrome in Indianapolis. Yes, thats right, 4km of usage. The bike has sat in my retail shop, my rafters and another retail shop since then. Never ridden again. Enough about the bike, lets talk crankset! Black anodized 170 arms, 39t timing rings and 48t drive ring. All pitch is 1/8". Phil Wood sealed Pro bb's are included in the price. If you like rare and not available anywhere parts, these are probably as rare as they get. Perfect for your Rohloff tandem project!