Not sure the size band you need? You can purchase multiple smaller bands to equal the tension of heavier bands. This will provide numerous tension options. You can use the bands individually or combine them and receive additional tension levels
Red(5-15LB): 2080 x 6.4 x 4.5 mm/81.9 x 0.26 x 0.18 inch
Blue(15-35LB): 2080 x 13 x 4.5 mm/81.9 x 0.51 x 0.18 inch
Purple(25-65LB): 2080 x 22 x 4.5 mm/81.9 x 0.87 x 0.18 inch
Green(35-85LB): 2080 x 32 x 4.5 mm/81.9 x 1.26 x 0.18 inch
Black(50-125LB): 2080 x 45 x 4.5 mm/81.9 x 1.78 x 0.18 inch