Limited Edition Stephen Murray Stay Strong BMX cranks from Profile. Featuring a unique Stry Strong design. Profile have been the premiere brand for 3-piece cranks for the last 15 years or more. These cranks are made in the USA. The arms are made from 4130 chromoly and the spindle is a heat treated gun drilled hollow 4130, 48spine spindle. Still the best cranks around and they now come with the flush bolt upgrade and hollow spindle as standard.