Packing List1pcs x Titan Extruder (NEMA 17 Stepper motor is not included, but you can find 42-23 or 42-38 from us as well.) NotificationPlease revise the E-steps in the firmware after installation. Recommend E-steps:385 Dual Drive Technology3:1 Ratio of extruding with high strength, able to print more kind of 3D printer with good precision. Compatibility Compatible with all 1.75mm filaments in the market. Support remote and short-distance feeding with flexible filament like TPU. WarrantyEvery product passed QC before shipment. But if you have problem, we provide free return/exchange in 90 days, pls contact us.