What this actually is

Not hand-knotting. Not a ventilating course. This is 3D injected construction, built to be fast enough to be commercially worth doing and precise enough to read as real growth from a few centimetres away.

You build the base. Measure and mark it to a real head. Inject the hair, control the density, set the hairline, seal and finish. You work on your own pieces from the first hour to the last and you take 2 to 3 of them home, finished, certified, ready to put in front of a client.

How it works

Every participant works on their own project from the first morning. Theory is kept to exactly what you need to make the next decision. The rest of the time your hands are on the work, with Eva moving between you.

Day One: The Base. Everything the finished piece depends on. You will manufacture and prepare the base, measure and mark to the exact size required, prepare your materials, and set up the Inject Machine Plus properly, the step most people get wrong before they have injected a single hair.

Day Two: The Injection. Hair injection, density control and the hairline, the three things that decide whether a piece looks real or looks like a wig. Then sealing, finishing, quality control, and professional attachment to the scalp including safe distance and aftercare.

Day Three (Tier 3 only): The Extensions. The same machine and the same principle, turned into a second income line. You will manufacture invisible injected extensions yourself, in minutes, instead of ordering them in and marking them up. Keratin, microlink and double-sided tape too, all removable, maintainable and reusable.

You also leave with

• Your 2 to 3 finished pieces: the prostheses or frontals you built in class, yours to keep, photograph, and show clients as proof of what you can now make.
• Official certification: an official certificate from Eva Spiess / Inject Machine, awarded on completion of your pieces.
• Hair Mastery Community: lifetime access to the Hair Mastery network, ongoing support and connection with graduates worldwide.

The Finished Pieces Guarantee

Every participant leaves this class with at least two completed, professional-standard pieces built with their own hands, and time permitting a third, or you are welcome back on the next available date at no cost.

Dates and cities

First dates begin November 2026 across the USA, Canada and Australia. We confirm cities based on where the interest is, so tell us your city when you enquire. Prices exclude travel and accommodation. Payment plans available on request.