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Hi Luka,
Most likely those motors are 200s/rev, NEMA 17 size, rated at 12V, producing close to 300Nm torque or less
Steppers are not easy to burn: the only way to do so is to use them at much higher voltage, then they will draw excessive current and overheat, but you can very easily detect that condition (when they become too hot to handle).
The maximum speed depends on coil inductance, and some other mechanical parameters, but very rarely they can be run much faster than 1000steps/sec. If you try to run them faster, they will simply stall and vibrate around one position and that will be it.
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