WERFIT multi-purpose toning tube, made of natural latex, is your one-stop shop for all your workout needs. Resistance bands can quickly intensify your workouts by focusing on a certain muscle. They build tension surrounding the muscle, which aids in its activation. If you want to lose weight and gain muscle strength, then yes. That is precisely what these toning tubes do. Resistance Tubes come in different colors to represent different resistance. They are also sold in sets with different level of resistance. Resistance Tubes come in different colors to represent different resistance. Whether you are a beginner or an expert, choose any that meets your fitness requirements – Red 20lb, Black 30lb, Orange 40lb, and Green 50 lb. For increased comfort and support, the resistance tubes come with cushioned Foam Handles.