What's the difference between the Hawaiian sling vs pole spear?

Hawaiian Sling Pole Spears for Spearfishing

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84cm Rubber Hawaiian Sling for Pole Spear

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How to use a Pole spear

HAWAIIAN SLING vs POLESPEAR, What's better?

3 in 1 Traveler Pole Spear

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Pole Spear Resting Hook

Find Top-Quality And Efficient Pole Spear