DESCRIPTION DURABLE RUBBER MATERIAL - Come in 5 levels of resistance for easily customizing the intensity of your workout Perfect for stretching to increase your mobility and flexibility,toning and strengthening your muscles LIGHTWEIGHT AND PORTABLE - Which means that you can take them with you wherever you go VERSATILITY AND DURABILITY - Simply change your position to target different muscles in arms, chest, belly, gluteus, legs APPLY - Perfect for fitness, body shaping, weight loss, resistance