Amazon.com Product Description
Suitable for use with all Stamina Gyrotonic Transformers (models 1000, 1500, and 2500) for upper- and lower-body strength training, these color-coded coils increase a Gyrotonic Transformer exercise machine's standard 90-pound-resistance coils by 200 percent, 250 percent, and 300 percent. Accompanying the power coils is a PowerBar with chains that attaches to a Gyrotonic Transformer (instructions included) and a 23-minute workout video that offers training instructions at four strength levels: beginner, intermediate, advanced and elite.