Some Bungee Cords with different sheath braiding and inner core material can stretch to different lengths,
Our Regular USA Made Bungee Cord should not exceed 50% of original length.
Our Marine Grade Bungee Cord has a different braiding and can not stretch as far as our regular bungee cord, we recommend not stretching this cord more than 40% of original length.
Hope this helps with your question
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Hook & Cord