Pentel® Twist-Erase III 0.5 MM Assorted Mechanical Pencil Are Refillable For Continued Use. Each Twist-Erase Mechanical Pencil Features A Premium Barrel Design With Latex Free Grip For Comfort And Control. Pentel Mechanical Pencil Model Includes An Oversized Eraser That Advances And Retracts By Twisting The Barrel.