The Compact Stainless II features a stainless steel slide and frame. The frame itself is .400 inch shorter than the full length Pro Carry but still holds 7 rounds. Pro Carry models are available with either stainless steel or aluminum frames. Kimber aluminum frames are machined from solid blocks of 7075-T7, the hardest and strongest available. Moreover, these frames are run on the same machines and hold the same tight tolerances as steel frames. Tested to 20,000 rounds with no meaningful wear, the weight savings they offer does not come at a compromise.