Great for brightening up your pencil case or pen pot, this adorable Shark Blue Erasable Pen features blue heat-sensitive ink.The ink magically disappears when rubbed with the plastic sphere at the end of the pen. This sphere will not ruin the surface when rubbed and does not wear down like usual erasers.An easy-glide nib, soft touch pen casing and adorable animals will have you wanting to collect the whole set.. Shark Erasable Pen. Blue heat-sensitive ink. Erase mistakes by rubbing them with the plastic sphere. Sphere will not wear down like usual erasers. Sphere will not ruin surfaces. 0.7 mm tip. 0.35 mm nib. Easy glide. Soft touch feel. Approximate dimensions (mm) H150 W10 D10. Weight 5g