Body Sport Studio Series Resistance Tube, Heavy, Red, Latex. Custom tailor your workout with Body Sport Studio Series Resistance Tubes. Available in Light (blue), Medium (yellow), Heavy (red), or Extra-Heavy Resistance (green), these tubes are color-coordinated for easy identification and allow you to choose how much resistance you need. Tubes are available with either hard handles or cushioned handles and are made with latex. The Studio Series Tubes are available in bulk packaging, making them ideal for fitness studios. Start building up your resistance workout today.