50120 High Elasticity Comprehensive Fitness Training Pull Rope Equipment Hollow Round Rubber Band Casing
50120 Model Size The front number 50 represents a hollow inner diameter of 12mm
The number 100 at the back represents the outer diameter of 10.0mm , the thickness of the rubber tube =(Outer diameter 10-inner diameter 6mm)/2=2mm
50120 bearIt takes strength to pull it apart, about 15kg
60100 bearPulling away requires strength about 12kg
6090bearIt takes strength to pull it apart, about 7.5kg
3070 bearIt takes strength to pull it apart, about 8kg
4070 bearIt takes strength to pull it apart, about 7kg = solid 6mm
3060 bearPulling apart requires strength, about 6kg = solid 5.5mm
2050 AcceptPulling apart requires strength, about 5kg = solid 4-4.5mm
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