This is the Treadmill Doctor walking belt for the Ls10.0t Treadmill. The size of the belt is. Fits the following models: Livestrong LS10.0T - 2011 (TM406), LS10.0T - Canadian 2011 (TM406B), LS9.9T - 2010 (TM380).. When it comes to replacement walking belts Treadmill Doctor has been a leader in the fitness industry. Our walking belts are made from quality polypropylene materials, 2 ply construction with the backing made of polyester blended material. A warranty for our walking belts is offered depending on your setting you may want to opt for the Lifetime warranty when in a residential setting and the 1-year warranty in a commercial setting.