VEXpro GT2 3mm Timing Belts - 9mm Width - VEXpro 217-5881, A 9mm wide GT2 3mm timing belt. The belt goes hand in hand with GT2 timing pulleys, and is great for low-load applications.GT2 belts use a smaller pitch than HTD belts, which means you can use larger reductions in those tight fit areas of your robot. GT2 timing belts are ideal for the lower loads associated with the first reduction in a gearbox, or motor to flywheel, etc. VEXpro 217-5881 45t x 9mm Wide Timing Belt GT2 3mm