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Adjustable resistance thumb trainer from Otevoima
Light spring: 2.5mm wire diameter, top resistance 8kg/18lbs, bottomed out 13kg/29lbs.
Hard spring: 2.8mm wire diameter, top resistance 13kg/29lbs, bottomed out 20kg/44lbs.
Reviews
5.0
2 ratings
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Feels good. I think this will help me on my journey to lifting an Inch.