Come and see our amazing products. The sit-ups and stretch fitness chest expanders are made of TPE material. Ideal for yoga, strength training and chest expansion. unisex. Great for travel and storage. Long-term use can beautify the curves of the human body and strengthen the muscle lines, especially the upper arm muscles. Not only can thin thighs, waist, strengthen biceps, but also treat muscle soreness. Here is the green tension cord that can hold up to 20 lbs. We also offer 30 lb and 40 lb tension ropes, please contact us for an accurate price. Pls confirm with us about the packing info, stock color and exact production time before placing your order.