5*15kg max load for each spring springy and expansive springs reach 1.5meters/59inches. Easy to install and use. keep your body strong and cool fit for all body builder Manufacturered by ZUQIEE. Strong and comfortable streamlining design handles great tightness hard to deform. Please feel free to contact us if you have any questions we will do our best to provide you with the best service. Our company will deliver the goods to you as soon as possible the logistics speed is faster than amazon website. Material: high-quality rubber plastic+stainless carbon spring steel wire.