Set of 4 resistance bands designed for strength training and fitness. The tires are designed for both beginner athletes and professionals. It also proves to be excellent in the rehabilitation process. The bands are made from elastic and durable latex. Each of the bands is characterized by progressive resistance - this means that the more we stretch it, the greater resistance it will provide. Specifications: circumference of bands without stretching: 208 cm thickness of bands without stretching: 4.5 mm colors indicating the resistance of individual bands: - yellow - 1-8 kg, width 6.4 mm - red - 8-15 kg, width 13 mm - black - 15-25 kg, width 21 mm - purple - 25-40 kg, width 32 mm The bands are packed in a practical case.