Loop Resistance Chart

RESISTANCE THIN MEDIUM HEAVY EXTRA HEAVY SPECIAL HEAVY
COLOR Yellow Red Green Blue Black
6"
(15.24 CM)
.83 LBS
(.38 KG)
1.93 LBS
(.88 KG)
2.42 LBS
(1.1 KG)
3.6 LBS
(1.6 KG)
7 LBS
(3.2 KG)
12"
(30.48 CM)
1.5 LBS
(.68 KG)
3.63 LBS
(1.6 KG)
4.0 LBS
(1.8 KG)
6.4 LBS
(2.9 KG)

10 LBS
(4.5 KG)
18"
(45.72 CM)
2.1 LBS
(.95 KG)
4.8 LBS
(2.2 KG) 
5.6 LBS
(2.5 KG)
8.5 LBS
(3.8 KG)
13.5 LBS
(6.1 KG)
24"
(60.96 CM)
2.4 LBS
(1.1 KG)
5.8 LBS
(2.6 KG)
7.3 LBS 
(3.3 KG)
10.4 LBS
(4.7 KG)
17 LBS
(7.7 KG)
30"
(76.20 CM)
2.8 LBS
(1.3 KG)
6.6 LBS
(3.0 KG)
8.2 LBS
(3.7 KG)
12 LBS
(5.5 KG)
20 LBS
(9.1 KG)
36"
(91.44 CM)
3.1 LBS
(1.4 KG)
7.3 LBS
(3.3 KG)
9.2 LBS
(4.2 KG)
13.6 LBS
(6.2 KG)
22 LBS
(10 KG)
Measurements are approximate. The resistance is measured in pounds at listed length of stretch. It is advisable to move to a stronger tube to increase resistance rather than stretching a weaker tube to its maximum.

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