Zones for dynamic warm-up exercises to strengthen your muscles. 4 different forces to change the intensity of your exercises: 7 kg (≈ 35 x 2.5 cm) • 10 kg (≈ 35 x 4 cm) • 15 kg (≈ 35 x 4 cm), 20 kg (≈ 35 x 6cm). Very durable, washable at 30 ° C. Dimensions: Length: 35cm, width: 2.5 / 4 / 6cm,