Resistance band SMJ EX001 21 mm 11-29 kg black The resistance band SMJ Sport allows you to gain training effects. Product is light and practical, it will firm your body develop strength strength and speed . It is a good alternative for joints helping give them relief. Done from high quality material. Technical data:· material: 100% latex· weight: 11-29 kg· thickness: 4.5 mm· width: 21 mm· circumference: 208 cm