Feature: 1. APPLICABLE MODEL: Upgrade Y axes linear slide rail kit, suitable for Neptune 3, for Neptune Pro, for Neptune 4, for Ender 3, for Ender 3 Pro V2, for Ender 3 S1, for Ender 3 S1 Pro. 2. STABLE OPERATING: This linear guide rail has high rigidity and stability, ensuring excellent accuracy during movement, reducing printing vibration, and improving printing quality. 3. HIGH EFFICIENCY: This linear motion slide rail has good smoothness and low friction, reducing energy loss and mechanical wear, allowing 3D printer to work at higher speed. 4. EXCELLENT STEEL: This 3D printer rail is made of high carbon chromium steel, which has strong wear resistance, high hardness, stable movement, low noise, and uniform force. 5. INCLUDED PARTS: Including 2pcs rails, 6 sliding blocks, a pack screws, and other accessories, this 3D printer rail kit is easy to install and use, greatly improving printing efficiency. Specification: Item Type: Guide Rail Kit Material: High Carbon Chromium Steel Applicable 3D Printer Model: For Neptune 3, for Neptune Pro, for Neptune 4, for Ender 3, for Ender 3 Pro V2, for Ender 3 S1, for Ender 3 S1 Pro. Package List: 2 x Guide Rails 6 x Slide Blocks 1 Pack Screw Accessories 2 x Accessories