Each of our headsets are precision-made and assembled by hand in our Minnesota machine shop. Choose from Premium or Performance options, as well as EC (External Cup), ZS (Zero Stack), and IS (Integrated Standard). Here, Ari packages a Zero Stack Headset for a lucky customer. #wolftoothcomponents #machinedinminnesota #builtbyhand #mtb #mtblifestyle #mountainbiking #adventurebybike #bikeupgrade