Compare stroke, battery system, weight, grip, controls, connectivity, ergonomics, and workflow tradeoffs. Manufacturer facts are date-stamped and the site avoids inventing medical or hygiene claims.
Cheyenne
The SOL Nova Unlimited II adds an integrated display, button or motion control, fast slide-in battery changes, Steady plus three Responsive modes, and interchangeable drive units across multiple stroke choices.
Best for: Professional artists who want a premium wireless pen with display controls, responsive modes, fast battery swaps, and modular drive-unit options
FK Irons
FK One Adjust is FK Irons' adjustable-stroke wireless machine, offering 2.0-5.0 mm stroke settings in 0.5 mm increments, drop-in battery power, and up to 12 hours of combined battery runtime in the manufacturer's current comparison data.
Best for: Artists who want one wireless FK platform with broad mechanical stroke adjustment for lining, shading, and packing
FK Irons
FK Irons EXO is a modular 9-watt brushless tattoo machine available with a 4.0 mm stroke, a 40 mm ergonomic grip, and a detachable RCA module that can be swapped for compatible PowerBolt wireless power.
Best for: Artists who want a front-weighted modular machine that can operate wired by RCA or convert to wireless PowerBolt use
FK Irons
FK One Update is a wireless pen platform with a digital display, 0.2V voltage adjustments, removable battery power, and 3.0 mm or 4.0 mm fixed-stroke configurations. FK currently offers it in Stealth, Gunmetal, and Pop Pink.
Best for: Artists who want a simpler FK wireless pen with digital visibility, long battery life, and a choice of 3.0 mm or 4.0 mm fixed stroke
FK Irons
The Spektra Xion is FK Irons' compact RCA pen platform, listed with interchangeable 3.2 mm and 3.7 mm cam options, a balanced 25-32 mm grip range, and a much lower weight than the brand's battery-heavy wireless machines.
Best for: Artists who prefer a light, balanced RCA pen and do not need onboard wireless electronics
Critical
The Critical Torque Lite 3.8 is a lighter wireless configuration built around a 3.8 mm stroke, V3 battery interface, Bluetooth 5.0, and a 5 oz assembled weight for artists prioritizing maneuverability.
Best for: Artists seeking a lighter Critical wireless setup for lining and shading without giving up V3 controls
Critical
The Critical Torque 4.2 combines a German brushless motor, Precision Strike technology, vibration damping, a V3 battery interface, Bluetooth 5.0, and a medium-long 4.2 mm stroke aimed at versatile professional work.
Best for: Artists who want a firm hit, long-session wireless workflow, and Critical Connect ecosystem integration
Cheyenne
Cheyenne's SOL Nova Unlimited 4.0 is a wireless pen with Steady and Responsive modes, 25-140 Hz operating range, low-vibration brushless drive, and two included rechargeable batteries for continuous studio rotation.
Best for: Artists who prioritize low vibration, simple controls, removable batteries, and a clean wireless workflow
FK Irons
The FK Irons Flux Max combines PowerBolt II wireless power, a built-in digital menu, Bluetooth connectivity, eGive adjustment, and a 4.0 mm stroke suited to versatile lining, packing, and general-purpose work.
Best for: Professional artists who want a feature-rich wireless pen with strong control over power and give