Thick and Thin Eraser Core Replacement: The electric eraser comes with 12pcs 5mm replaceable rubber cores and 10pcs 2.3mm rubber cores. The two interfaces make it easy to replace the eraser, and the length of the eraser can be adjusted to meet various painting needs. Rotate/erase with just a light press. Erases with one touch and prevents quick wear on the tip. Comfortable Grip, No Hands Dirty: The automatic eraser is ergonomic and easy to use. Long press the button to work automatically, release it to stop automatically, easy to operate, easy to grasp the wiping effect, suitable for removing highlights, shadows, edges and details in sketch work. Compared to cube erasers, it is easier to grasp the area to be wiped, with less debris and a smoother experience. Battery Powered Eraser Dual Mode: The motorized eraser is powered by 2 AAA batteries (not included). Support electric and manual mode. When power is low, pencil marks can be eliminated with a light wipe. Suitable for art students, artists, teachers, middle school students, beginners and painting lovers. Wide Applications: The electric eraser is suitable for drawing sketch pencils, graphite pencils, 8B 7B 6B 5B 4B 3B 2B B HB FH 2H pencils, colored pencils and crayon pencils, suitable for drawing, office or school work, the mini compact electric eraser can fit The pencil case is neat.