Merrithew Strength Tubing for Core Available in 3 strengths: Light (purple), Regular (red), Extra Strength (blue). Also available in greater resistance for smaller range with heavier resistance, see STOTT PILATES Strength Tubing, CARDIO Increase full-body strength and improve range of motion and co-ordination Portable and versatile. Length 49 Inch (125cm) not including handles. 23.5 Inch (60cm) of tubing covered in fabric for comfort Foam covered handles for softer grip Made of TPR (Thermoplastic Elastomer)