Save weight without giving up performance. Moser offers hi-performance aluminum spools that weigh approximately 4 lbs. less than our steel spools. That doesn’t mean they are not as strong. In fact, the spools feature a thicker ring gear flange and large diameter mid-section for increased strength. Save weight without the wait. Ship same day (if ordered before 2p.m. est).Application: 12 Bolt Car 33 spline Aluminum (5.1 lbs)