High strength steel Bili, than the market general Bili strength, resistance to bending, anti-oxidation, can be used longer. Different specifications, a special promotional price. Removal of Hong Kong, Macao and Taiwan are not shipping, the other region can free shipping. [Name]: Jin Aolei genuine black steel Bili [specification]: 30kg 40kg 50kg 60kg [NW]: 30kg class Bili long 59CM 1.3 kg weight class 40kg strength of arm length 61CM Weight 1.5 kg 50kg weight class Bili long 64CM 1.8 kg 60kg weight class Bili long 64CM 1.9 kg [Packing]: color box packaging manufacturers genuine, certified by the National QC, PICC PICC insurance. Trustworthy. Health Health: www.laozongyi.com Friendly reminder: all buyers friend, please choose the kilogram level buy, so buy a big, hold still. We can not exchange, thank you! Usage: 1. Arms bent, curved spring force in the back of the neck. 2. Arms forward and upward bending of the spring, then relax. 3. Arms close to the chest, bending the spring, then straight, slowly relax. 4. Standing, feet apart, bend the right elbow with his left hand bend spring, then bend the left elbow with his right hand bent spring. 5. Both arms behind clenched spring, and then gradually straighten bent downward. Note: 1. Please check before each use joints Bili is solid, not loose. 2. Please choose their own level of physical strength of arm, so as not to strain muscles. 3. Use the handle on the seat belt arm around your wrist. 4. Use, should choose a relatively spacious grounds exercise, so as not to get rid of wounding. 5. It is recommended for children under 12 years of age do not use Bili. Bili Fitness Tips: 1, the positive U-shaped arm can practice triceps, pectoralis major, deltoid muscle bundle; 2, Bili can practice inverted U-shaped biceps, pectoralis major, deltoid and latissimus dorsi beam. Limit each packet to do. Remember not every day do it, but every other day, every time you do anaerobic exercise is to destroy as much as possible to your muscle tissue, and then plenty of time and nutrients to repair damaged muscle tissue, allowed to grow, plainly muscle is anaerobic exercise you finish the rest of the time long. Scientific fitness, will have a perfect muscle