Shimano Stella SW Features:

    Paladin Gear Durability Enhancement with Low Wear Rate Pinion Gear
    Propulsion Line Management System: Propulsion Spool Lip, SR One-Piece Bail Wire, Power Roller IV Oversized Roller with Overflange for the Ultimate in Line Protection, Redesigned Bail Trip, S-Arm Cam
    Aero Wrap II Oscillation
    Cold Forged Aluminum Spool: Proprietary Coating on Spool Lip is harder than a Ti coated Stainless Steel Spool Lip, Ceramic Coating on entire spool for extreme corrosion resistance
    Diamond-Like Carbon (DLC) Coating on Line Roller
    SW Concept: Sw-Water Resistant Body, SW-Hyper Disk Drag (Twin Disk on 18000 & 20000 sizes), SW-Assist Stopper (except 5000 size), SW-Water Proof Drag, SW-Lightweight Ergonomic Handle Grips prevent premature bail trip
    SR Concept: SR-Balanced Body, SR-Slider, SR-3BB Oscillation, SR-Handle, SR-3-D Gear Design, SR-Floating Shaft, SR-Rigid Support System
    S Concept: S-Rotor, S-Guard, S-Shield Roller Clutch, S-Arm Cam
    S A-RB Bearings (Shielded A-RB)
    Twin Bearing Drag
    Super Stopper II
    Stopperless Design (No Anti-Reverse Switch)
    Septon Handle Grip
    Direct Drive Mechanism (Thread-In Handle Attachment)
    Fluidrive II
    Maintenance Port
    Aluminum Frame, Sideplate & Rotor
    Dyna-Balance