I used to think it there wasn't anyway that I could learn how to draw with chronic pain, however after much experimentation of different drawing techniques
Sakura Sumo Grip Electric Eraser
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SumoGrip EE-3000 - Sakura of America
Electric Erasers with 2 Eraser Sizes, Our electric eraser includes 2 eraser holders to hold both φ2.3mm and φ5mm erasers. Use the bigger one to create thick highlights and the smaller one to erase tiny parts like hair. Ideal for artists and professionals. Battery Powered Electric Eraser, This electric eraser is powered by 2 AAA batteries(Not included) and helps you release your hands while drawing and drafting. Simply push the button to remove the marks.
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Sakura Sumo Grip Electric Eraser #SKEE3000
Cordless Electric Eraser now in the SumoGrip eraser product line Durable, long-lasting motor with strong torque produces over 10, 000 RPM Pocket sized
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