VECTOR is the Ultimate Resistance Training System. This is an accessory for the VECTOR 1 System and includes additional light tubes and heavy tubes. At full extension, each Light Tube (light blue) provides 5 lbs. of resistance, and each Heavy Tube (dark blue) provides 13.5 lbs. of resistance. The VECTOR 1 System offers 60 inches of pull length versus 45 inches for the VECTOR TRAVEL.