From Singletrack Magazine's coverage of the NAHBS:
(Unfortunately they no longer have the article from 2007 on their site)
"Ahrens had a display of steel and aluminium bikes on show, with geared and singlespeed bikes, all with wishbone yokes (welded on the steel bikes and machined on the alloy ones). He also makes seatpost, and steerer, mounted bottle openers for those after-ride celebrations. Not a bad headset spacer, eh?"