These are steel springs with a passivation process done to prevent corrosion.
Use heavy duty springs only if you are having trouble stabilizing regular springs. Heavy duty is primarily for use with cartridges with very light spring tension, and regular springs for everything else.
WARNING: Using heavy duty springs with cartridges with strong spring tension can overload the motor and reduce its lifespan. Use only if necessary.
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.