The magnetic zipline brake uses a reaction between a non-conductive metal and magnets called eddy current. the principles itself is very reliable as it is bond to a law of physics.
it allows us to bring to a stop rider from speeds of up to 70 km/hour regardless of the rider’s weight. in other words, this zipline brake system will apply more brake force as the landing speed increases so lighter people arriving slower will not be affected too much by an adjustment made for heavy people. However, compared with a counterweight progressive brake, the impact can sometime be abrupt.