TWO RESISTANCE LEVELS FOR CUSTOMIZED TRAINING: Red (10lb) and Green (15lb) bars each measure 12" long and vary in diameter for progression; made from durable dry natural rubber for consistent performance across therapy stages IMPROVE GRIP & ARM STRENGTH: Designed to strengthen hands, wrists, and forearms while helping relieve discomfort from conditions like tennis or golfers elbow and tendonitis, the THERABAND FlexBar is widely used in rehab, sports training, and occupational therapy