Blade Strength

Safety comes first

Blunts, sharps and trainers

We designed our products for the practice of Historical European Martial Arts, or HEMA. As a result, they are exposed to serious use even on a daily basis, not to mention tournaments. Even with proper use and maintenance, we have to accept the fact that these tools will wear out over time, however, it does matter how and how quickly this happens.

Despite our best efforts, there have always been and always will be warranty cases. Fortunately, these cases are quite rare, although we know this won’t cheer you up in the middle of said warranty case.

We categorize our feder blades into three groups, based on the force a feder generates while bending:

Light blade

The “light blade” is not for heavy sparring or tournament usage. It bends really well, but because of this flexibility, its durability is limited. We suggest that you use it for light sparring or controlled practice. 

Warranty: 1 YEAR

7 - 9,5 kg

(under 10 cm of bend)

Medium blade

The “medium blade” combines flexibility and durability therefore it’s the common choice for every day’s usage. Also, that’s the upper limit for our “Trnava feders” because of weight distribution and for proper point of balance.

Warranty: 1 YEAR

11,5 - 13 kg

(under 10 cm of bend)

Strong blade

The “strong blade” is for full speed trainings and tournaments. The blade is still safe for full-strength trusts, but because of its high durability, it won’t let you down in the middle of your most important fight.

Warranty: 1 year

13,5 - 15 kg

(under 10 cm of bend)

How to measure the strength of A FEDER blade?

We had created a rather simple system in order to make our blades measurable basically anywhere. If you are at home, or at a tournament it doesn’t matter, you will only need a personal scale. There are two methods: the simple one that you will probably use, and a bit more advanced and accurate one, that we use at the workshop to adjust the blades.

The simple method

It’s a simple, quick, mobile and pretty accurate method to determine that the blade actually is what it’s said to be. What do you need to measure the strength of the blade? You will need a personal scale. After you got the scale, you need to place the feder on the scale vertically (and you need to stabilize it with your hand, but don’t use any kind of force).

And here comes your muscle exercise: When the scale shows precisely zero (this is very important, always measure from zero), you need to push the feder down vertically – bend it – until it surpasses a point of resistance. You will feel this point, it’s a feeling when the blade is not fighting against you any more, just bending like a spring. This state can be usually achieved with pushing 10 cms. When the blade is bent in the no resistance zone, your scale will measure a pretty fixed amount of weight. That will be the force of the blade or “FoB”

Caution: Please use some hard surface material or a piece of rubber to dissipate the puncture force of the feder’s tip to avoid damaging your scale.

Where can it go wrong?

  • you didn’t start from zero on your scale
  • you didn’t push the feder vertically
  • you didn’t push the feder down enough (10-12cms)
  • you pushed the feder down too much
  • there are thousand types of scales, it is possible that yours is not calibrated like ours, but we still think the results will be within the margin of error in most cases

These are the possibilities where you can make a mistake. We therefore advise you to always measure 3 times, just to be sure. It will take like one more minute, but it can filter out incorrect measurements.

The advanced method

We’ve built a device, which works the same way as we mentioned above, but it extracts the human from the equation. Because of this, we can get very accurate, repeated readings.

Fast customer service

Response within 7 working days


Our products made by hand


Resellers around the globe


15+ years of experience