Standard Model of the Graph Series with Premium Eraser Color: Matte Navy Matte Grey Lead Size: 0.5mm (HB) Built-in Eraser: 5.3mm diameter × 26mm length (Refill eraser: ER-MG) Key Features: ✔ Precision Fixed-Pipe Tip – Designed for drafting and fine writing, the fixed pipe tip provides a clear view of the writing area for accurate, stable, and detailed work. ✔ Furenock (Shake Mechanism) for Effortless Lead Advancement – Simply shake the pencil up and down to extend the lead without repositioning your grip, ensuring a smooth writing experience. ✔ Furelock Mechanism to Prevent Accidental Lead Advancement – Slide the clip upwards to lock the shake function and prevent unintentional lead advancement inside a pencil case. ✔ Rotating Eraser for Precise Corrections – Twist the eraser unit counterclockwise to extend the premium MONO eraser for precise and clean erasing. How to Refill Lead: Remove the eraser unit. Insert new lead (up to 3 pieces) into the back end of the pencil. How to Replace the Eraser: Extend the eraser until the stopper becomes visible—this indicates it's time for a replacement. Twist the eraser unit clockwise until it stops, then gently pull out the used eraser. Insert a new ER-MG refill eraser, then twist the unit counterclockwise to retract it. Perfect for students, professionals, and artists, these Mechanical Pencils combines precision, convenience, and high-quality materials for a superior writing experience.