Material: High Torque Engine Made of grade-A steel with low self-inductance and rapid response, which avoids system errors. Specifications: Model: 17HS4023 Size: 42 x 42 x 23mm /1.65 x 1.65 x 0.9 inch; Step Angle: 1.8 Degree (200 steps/rev); Current: 4.0V; Rated current: 1.0 A; Resistance: 3.5 Ohms; Torque: 13Ncm / 18.4oz.in; Cable Length: 1m Compatible with your Arduino projects, Prusa I3 Series, Ultmaker Series, Core xy Series, Kossel Series, SLA Series. Lower resistance value: Greatly increases the thermal conductivity of the motor to reduces the rise in temperature. Product provided by MMOBIEL - We always try our best to exceed your expectations at every turn. Join the ever-growing list of satisfied customers and discover the difference with MMOBIEL.