The newest innovation for elite resistance training, Twist SMART Toners offer a safe and comfortable solution to traditional tubing for group exercise, pilates, yoga, travel, etc. SMART Toners will out-last even the most dedicated user and are durable, compact, light-weight, portable, and available in various length and resistances. SMART Toners are designed for personal or class reistance workouts and work perfectly as replacement for naked tubing. Combine SMART Toners with the break apart SMART Bar to quickly add barbell exercises to your routine. For a small difference in price you receive a world of difference in comfort, durability,and safety.