Military-grade materials, wild pull not broken High-density latex tube + nylon braided outer layer: tear strength of 3000N (ordinary elastic band only 800N), 100,000 times by the tensile test without deformation, violence is not afraid to break; User feedback: "previously bought elastic band avalanche hit the hand, this force to the face red are not a problem, the sense of security to pull the full! " --Fitness enthusiast Xiaolin Black and gray sports version of the exclusive design, low-key sense of professionalism Matte frosted surface: non-slip and sweat-absorbing, even if the palms of the hands are sweaty can also be a steady grip, to avoid slipping out of the hand during training; Reflective logo strips: at night when outdoor training, the light irradiation logo reflective, to enhance the safety. Door anchor + anti-slip foot pad, home training 0 injury Thickened door anchor: built-in steel pins, can withstand 200kg tension, suitable for all standard door frames (thickness of 3-5cm), no need to drill holes for installation; Silicone anti-slip foot pad: fixed feet when stretching, to avoid slipping and spraining, measured anti-slip coefficient increased by 60%. 5 levels of resistance adjustment, from novice to expert Rotating resistance buckle: one hand can quickly adjust (10kg/20kg/30kg/40kg/50kg), to meet the different needs of rehabilitation training, shaping, explosive power improvement; Clear resistance marking: each level of resistance is marked with a different color, so there is no need to repeatedly test, more efficient training.