Different Resistance Bands:
Band I (Jumpstretch Mini) - 1/2"" width, 5-35 lbs resistance.
- Good for stretching, mobility training, abs work, ect.
Band II (Jumpstretch Mini Monster) - 1/2"" width, 10-50 lbs resistance.
- Good for DE squats, DE bench, banded GM's, ect.
Band III (Jumpstretch Light) - 1 1/8"" width, 25-80 lbs resistance.
- Good for ME bench (various), DE squat, reverse band deadlifts, ect.
Band IV (Jumpstretch Average) - 1 3/4"" width, 50-120 lbs resistance.
- Good for ME Squat (various), reverse band squat, bench, or deadlift.
Band V (Jumpstretch Strong) - 2 1/2"" width, 60-150 lbs resistance.
- Good for Reverse band bench or deadlift, or for DE Squatting for those with a 650 - 900 lb squat.
Band VI (Jumpstretch Monster Band) - 4"" width, 200 lbs resistance.
- For those who are human fork lifts.
Definitions for these descriptions were found at these stores:
Midwestbarbell
EliteFTS
For a first time buyer who has decent numbers, I'd recommend getting a combo deal with Bands II, III, IV. Saves you money.