I just replaced my Leupold mounts with Talley lightweights for a 30mm tube. I measured each with a kitchen scale and the Talley's weighed just under 3 ounces and the Leupold weighed 6 ounces. The density of aluminum is roughly 1/3 of the densitiy of steel. My Talley mounts were a little larger in bulk compared to the Leupolds.
