Features: » 100% Natural Latex - It is made of 100% natural latex material. Compared with other rubber materials, it has good resilience and strong output resistance. After 50000 tensile test, it is safe and durable. » Multifunctional Training - The flowing sand is wrapped in soft neoprene, making it easy to grip. » 4 Kinds of Resistance - There are four resistance rings of different strength, light 10lb, medium 20lb, heavy 30lb and overweight 40lb. The resistance rings allow you to adjust the exercise intensity to exercise each major muscle group. » Easy to Carry - The four resistance snares are fitted with a drawstring storage bag that can be easily placed in a backpack or suitcase. » Various Scenes - Compact and light, prefer for personal , family, travel , gym ,etc.