Experience more intense acceleration and deceleration
Strength should correspond to body weight
Only to be used with 2 screw snap hooks per spring
Product description
The Erfi tension spring will make your swing system even more versatile, allowing you to experience more intense acceleration and deceleration. The strength of each spring used should correspond to the user’s body weight. For safety reasons, the springs should only be used with screw snap hooks (2 per spring, order at the same time).
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