GT2 timing pulley 16 teeth GT2 timing pulley 5mm, 20 teeth GT2 timing pulley 5mm, 20 teeth GT2 timing pulley 6,35mm, 20 teeth GT2 timing pulley 8mm. Made from high quality aluminum, High hardness, Waterproof and rustproof, corrosion resistant and more durable, Suitable for 5mm or 8mm width belt (we have different options), Providing a smoother transition between belt and minimizes the risk of the belt slipping, GT2 timing belt pulley system especially suited for linear movement and positioning, good performance for 3D printers.