For the same label power level, the power is different: Red>MAX>Gold>Black>Grey. For example: The power twister is labelled with 80kg/176lbs, the real power resistance is : Red 80kg >MAX 80kg >Gold 80kg >Black 80kg>Grey 80kg. Attention Please: This RED series is only for the professional person, if you have not used our HAOYING power twister, please don't buy this RED series, please take the black ones or gold ones for try first. Material: Germany imported carbon steel and ABS plastic handle. Data for each level: 60kg(132lbs): 2.1kg(weight),630mm/25"(length) 70kg(154lbs): 2.5kg(weight),650mm/25.5"(length) 80kg(176lb): 2.7kg(weight),669mm/26.3"(length) 90kg(198lb): 3.15kg(weight), 685mm/27"(length) 100kg(220lb): 3.3kg(weight), 703mm/27.6"(length) 110kg(242lb): 3.68kg(weight), 720mm/28.3"(length) 120kg(264lb): 3.79kg(weight), 735mm/28.9"(length) 130kg(286lb): 5.08kg(weight), 760mm/29.9"(length) Handle rope length: each bar : 15cm(5.9inch) Warmly Tips Before use please check the connection parts is firm,no loose phenomenon. Before use, please carry the handle seat belt on your wrist. When using, should choose relatively spacious field exercise, lest hurt to sell. How to choose according to individual constitution and decide, our items are super heavy duty, please do not overestimate yourself: 50kg/60kg(Strongest),70kg/80kg(challege), 90kg/100kg/110KG(amazing),120KG/130KG(Monster powerful)