Good Elasticity With 5 Level Resistance
X-Light: 600*50* 0.35mm tensile value of 5~10lb;
Light: 600*50* 0.5mm tensile value 10~15lb;
Medium: 600*50* 0.7mm tensile value 15~20lb;
Heavy: 600*50* 0.9mm tensile value 20~30lb;
X-Heavy: 600*50* 1.1mm tensile value 30~40lb.
