Feature: 1. Made from environmentally friendly elastic latex,durable and stretch further. 2. 4 exercise resistance band strengths-0.5mm (10-15lbs),0.7mm (15-20lbs),0.9mm(20-30lbs) and 1.1mm (30-40lbs). 3. You can combine the resistance bands together to give different resistance levels for your workouts. 4. Suitable for yoga,Pilates,working out,stretching and work out etc. Specification: Features: Made from the best quality environmentally friendly elastic latex, and stretch further. 4 exercise resistance band strengths-0.5mm (10-15lbs),0.7mm (15-20lbs),0.9mm(20-30lbs) and 1.1mm (30-40lbs). You can combine the resistance bands by stacking or knotting together to give different resistance levels for your workouts. Suitable for yoga,Pilates,working out,stretching and work out etc. Specification: Model: Set 1/ Set 2/Set 3/Set 4/Set 5 (optional) Material: latex Size: 600*50*0.5mm / 600*50*0.7mm / 600*50*0.9mm / 600*50*1.1mm Package size: 18*11*2cm/7.1*4.3*0.8in Package weight: Approx. 128g/4.5oz Package List: 4* Resistance Bands 1* Carry Bag ​1* Instruction NOTE: Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding. Package List: 4* Resistance Bands 1* Carry Bag ​1* Instruction NOTE: Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding.