Feature: No. PZ-15091SN Nose Retract Size(L*W*H):65.8 x 35.1 x 25.1mm Weight: 48g Speed: 0.7 s/60 @ 4.8V, 0.55 s/60 @ 6V Torque: 1.8kg/cm @ 4.8V, 2.0kg/cm @ 6V Landing Struct Diameter: 4mm Support Flight Weight 3.5kg Operating Voltage: 4.8v-6.0v Wire Length: 100mm No. PZ-15090SM Main Retract Size(L*W*H):65.8 x 35.1 x 25.1mm Weight: 45g Speed: 0.7 s/60 @ 4.8V, 0.55 s/60 @ 6V Stall Torque: 1.8kg/cm @ 4.8V, 2.0kg/cm @ 6V Landing Struct Diameter: 4mm Operating Voltage: 4.8v-6.0v Wire Length: 100mm Plug Type: JR Plug Maximum travel: 90 Use for wing span around 1.5m Support flight weight 3.5kg If you buy our products, you encounter any problems in the process of using the products please email us at the first time to tell us, we will answer you within 24 hours to provide you with quality service.