Treadmill Doctor Horizon Cst 4.5 Treadmill Running Belt Review HelpfulOwl Treadmill Belts July 7, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This is the replacement walking belt for the Horizon Cst 4.5 Model Walking Belt Size