Charles Leonard Multi-Purpose Felt Eraser, 5 x 2 x 1 Inch, Charcoal, 12-Pack (74500) Multi-Purpose Eraser is economical and strong! Removes all markings quickly and cleanly. Eraser can be used on all dry erase surfaces, leaving no streaks behind! This multi-purpose eraser is also ideal for chalkboards, collecting all dust as it erases! Clean the eraser with mild soap and water, for an extra long life.