Get effective strength training at home or anywhere with the safe, portable weight-resistance of GoFit Power Tubes. Available in eight different weight resistance levels, they deliver ultra-versitile options for your resistance workout routine. A GoFit Power Tube Training Booklet is included with GoFit Power Handles. Youll get proper usage instruction, and a detailed, progressive workout guide. Several exercise options are included, with pictures showing correct step-by-step usage. This expandable workout guide helps you get the most out of your GoFit Power Tubes to reap real fitness benefits. The GoFit Power Tube is made of heavy duty, premium components. Durable latex rubber tubing is strength-tested to determine reliable weight-resistance levels. The nylon webbing, stitching and connecting rings have all been beefed-up for optimal performance. And the innovative tube connection is designed for superior dependability. All-in-all, an ultra-versitile training tool.