For flat back benchers features our patent pending torque sleeve design combined with our new NXG Super Plus material. This new material is 26% thicker and stronger than the older NXG+ material. The result is double-ply type power from a single-ply IPF approved shirt. The Katana will take your benches to new heights! The Katana S/S for flat backed benchers is backed by an unmatched guarantee that’s as tough as you are: 2 years blowout plus an 18 month "No Run" guarantee!