Professional equipment specifications can change. Data below was checked against the linked manufacturer source on 2026-07-25. ComparePilot does not provide medical or infection-treatment advice.
Tattoo Machines
FK Irons Flux Max 4.0
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.
$799.99-11%
Was $899.99Verified Jul 26 · FK IronsStroke: 3.0 mm or 4.0 mm fixedPower: PowerBolt II
Best for: Professional artists who want a feature-rich wireless pen with strong control over power and give
Versatility94
Ergonomics85
Battery86
Control97
Value77
Advantages
Pros
- Built-in display with voltage/hertz control and session tracking
- PowerBolt ecosystem compatibility plus Bluetooth connectivity
- Balanced professional feature set for artists who want onboard adjustments
Tradeoffs
Cons
- Premium purchase price
- 206 g weight is heavier than several minimalist wireless pens
- Fixed stroke means artists wanting stroke changes need a different variant or machine
Machine and workflow snapshot
Key specifications
Stroke
3.0 mm or 4.0 mm fixed
Power
PowerBolt II
Runtime
Up to 6 hours
Weight
206 g / 7.2 oz
Length
126.5 mm
Grip
33-38 mm forward-weighted
Controls
Digital menu, eGive 0-3, volts or hertz, time tracker
Connectivity
Bluetooth
Compatibility
FK Irons grips, PowerBolt batteries, Killswitch ecosystem