Stackable up to 100 lbs. - hook More bands to your handles and you can get bigger and shred with less resistance. Whether you are a beginner or a professional athlete, you can find the suitable intensity of your workout. Be your personal home gym! – you can use the resistance bands with ankle straps and door attachment to exercise while you are watching TV or sitting in the office, totally save your money spent in the gym. Anti-snap promise - made of 100% natural latex, Portzon resistance bands will not dry out, snap, or deform, can maintain elastic for a long time, sturdy hook& metal carabineer ring will totally free your worry about the sudden snap.