The magnets in Ophena's safety stirrups are very strong and will last a long time (we are talking 10 years and longer). Same is true for the magnets in our insoles.
Irrespective of that, the insole itself will wear over time. Hence, we recommend to replace the insoles every 6-24 months depending on usage.
We also recommend to keep the insoles dry and let them dry properly in case they got wet. Do the same for the stirrups and keep them away from saltwater.