Cando AccuForce is a high quality latex exercise band that is used for rehabilitation and exercise. Achieve specific repeatable and measurable levels of performance with each rep. The patented indicators show exactly when four levels of elongation are reached. Each level of elongation corresponds to a specific amount of applied force. When a level of force is reached the indicator shape will have completely morphed from a rectangle to a square. Lightweight portable and measured repeatability! 5 progressive levels of resistance. Each level has four indicators that show when 50% 100% 150% and 200% elongation have been reached.