Magnetic 3-in-1 Eraser is specifically designed to be safe to use on glass surface marker boards. The felt eraser pad is reversible & excellent at removing dry-erase ink & dust to always deliver a perfectly clean writing surface. The 2-sided reversible feature of the pad means you get twice the lifespan out of the eraser; simply flip it over & start fresh. Plus, a third, integrated microfiber surface is also included on this eraser. It removes residue & offers a deep clean to virtually renew your board. The 3-in-1 eraser has a unique Spot-Erase Friendly Form, too. This unique shape is designed to help you erase those hard to reach corners of the board, & is great for a quick spot erase. Ideal for magnetic glass boards, this eraser is also magnetic. You can store it directly on the board surface so it is always close by when you need it. Durable molded handle of the eraser is comfortable in your hand. Board Eraser Application: Glass Dry Erase Only; Eraser Pad Material: Felt; Eraser Width: 2"; Eraser Depth: 6.5".