Heavy Duty – Featuring a durable construction made from double-coated latex, each flexible tube offers consistent resistance during movement. Its tear-resistant surface is guaranteed to withstand the most intense workouts.Versitile – These resistance bands can be used for rehabilitating leg, knee, back, and shoulder injuries. Each piece can be used to aid in recovery from ACL, MCL, patella, and meniscus rehab, as well as knee replacement.Lightweight and portable – This exercise kit can be used for mobility workout, assisted pull-ups, and bench presses. These fitness accessories are compact, lightweight, and easy to transport. You’ll have resistance training equipment wherever you go.Featuring three easy-to-use resistance bands with 20-, 30-, and 40-lb. resistance levels and a sturdy door anchor that securely attaches to any standard door frame.