ITEM NAME:Dual Drive Gear Extruder Kit for Ender 3 Ender 3 Pro CR-10 CR-10S CR-10S Pro Description: Double gear extrusion mechanism, strong extrusion force, smooth feeding. Suitable for 3D Printer Ender 3/Ender 3 Pro/CR-10/CR-10S/CR-10S Pro, etc. Used for 1.75mm filament. Improves printer performance. Aluminum alloy material, stable and durable. DIY aluminum block, need to assembly by yourself. Specification: Color: Red Material: Aluminum Alloy Package Size: 11.5 * 8.0 * 3.0cm / 4.5 * 3.1 * 1.2in Package Weight: 74g / 2.6oz Package Includes: 1 x Dual Drive Extruder Kit Excluding the black part.1 x Dual Drive Extruder Kit. Suitable for 3D Printer Ender 3/Ender 3 Pro/CR-10/CR-10S/CR-10S Pro, etc. Aluminum alloy material, stable and durable. Material: Aluminum Alloy. DIY aluminum block, need to assembly by yourself.