Description Built to Perform. Priced to Compete. The FK Irons ONE Wireless Tattoo Machine – 4.0mm Stroke blends premium build quality with smart, no-fuss design. Whether you’re just getting started or need a reliable workhorse for daily use, this wireless pen delivers uncompromising performance — with a fixed 4.0mm stroke perfect for bold lining, solid colour packing, and efficient shading. This machine runs completely wire-free, powered by 2x rechargeable Panasonic NCR 18500A batteries. Each battery offers up to 8 hours of runtime, and they’re hot-swappable with no fiddly screw-threading thanks to FK’s quarter-turn battery hatch. The ruby red battery cap also features a manual disconnect to prevent battery drain during travel. Key Features: Fixed 4.0mm stroke – ideal for lining and solid colour work 2x Rechargeable Panasonic 18500A batteries included 5–12V voltage range, adjustable in 0.5V increments LED colour-coded voltage indicator Simple 3-button control – power, voltage up/down Click-grip needle depth adjuster Cheyenne-compatible cartridge system Weight: 227g | Length: 134mm | Diameter: 38mm Body: 6061 T6 medical-grade aluminium Includes travel case with custom-cut foam Why Artists Choose the ONE: Zero cables, zero stress – pure wireless freedom Ergonomic grip with anti-roll grooves for comfort and control Battery disconnect keeps your gear safe in transit Made in the USA to exacting standards Compatible with all major cartridge brands (Cheyenne-type) Whether you’re prepping for guest spots or streamlining your daily setup, this machine offers reliable, pro-level performance — without the price tag of flagship models. Looking for more wireless options? Browse our full wireless tattoo machine range
