Check the listing for details. Spektrum Firma 4000Kv Brushless Motor. Condition: New. Listed at 44.99 USD. New in package Spektrum Firma 4000Kv Brushless Motor The Firma 4000Kv brushless motor is a great choice for 1/10 scale 4WD, 2WD, and on-road models running on 2S LiPo power. Featuring a low cog 4-pole 8-magnet rotor design, CNC machined aluminum housing, insulated high purity copper windings, high-quality alloy steel 3.175mm (1/8") output shaft, and precision bearings for high durability and smooth rotation. Preinstalled 4mm gold plated bullet connectors for easy installation, and perfectly matched for the Firma 85A Smart ESC. FeaturesExcellent upgrade for 540- and 550-size brushed motors with the same diameter and mounting pattern (vehicle must accept pinions with a 1/8" bore)High-quality 4-pole sintered rotor4mm gold plated bullet connectorsHigh-quality construction with precision ball bearings and hardened steel 1/8" shaft SpecificationsInput Voltage 6 - 8.4VRPM/Volt (Kv) 4000KvSensored NoMotor Design InrunnerMaximum Continuous Current 40AMotor Type BrushlessBushing Or Bearing BearingApplication 1/10 scale 4WD, 2WD, and on-road models running on 2S LiPo powerNumber of Poles 4Product Weight 7.4oz (210g)Shaft Diameter 0.125" (3 mm)Connector Type 4mm BulletEfficiency 81%Motor Class 1/10 ScaleMotor Size 3652 Includes:(1) Firma 4000Kv Brushless Motor Vehicle models vary. We DO NOT guarantee this will fit the vehicle specified in this listing!Verify that this item is appropriate for your vehicle. Consult your manual or vehicle manufacturer.Verify vehicle fit-ment before purchase.Returns will only be accepted on items that are returned in new, factory-sealed packaging. Used, damaged (unless damaged when it arrived to you), and opened items will not receive a full refund. Any and all warranty claims will be handled through the manufacturer directly.