This is the Hollis Stainless Steel or Aluminum Backplate 2.0 for Scuba Diving Features: Foundation for Hollis Technical Harness Systems Improved Ergonomics for More Comfortable Fit Short Enough to Fit Smaller Frame Divers Laser Cut & CNC Bent Plate Thickness: 0.12f (3mm) Awesome New Appearance Geometry of Webbing Slots Similar to Prior Design Ensure Reverse Compatibility Aluminum Backplate 2.0: Weight: 1.5 lbs (680g) Material: EN AW 6061 Aluminum Finish: Hard Anodized, Black Marine Grade Stainless Steel Backplate 2.0: Weight: 6.5 lbs (2.85kg) Material: 304 Stainless-Steel Finish: Bead Blast Electropolished & Chemically Passivated Design: Avoids Scratching, Looks Good After Years of Use The Hollis 2.0 Backplate Line is the foundation for the new Hollis technical harness systems. They feature improved ergonomics for a more comfortable fit, but are still short enough to fit smaller frame divers.