You should use the eraser to erase digital ink out of your interactive screen. You are able to change SMART hardware settings to personalize the behaviour of the SMART product, including how big the eraser.
To alter Eraser Settings
Press SMART Hardware Settings .
In case your computer is linked to several SMART product, top of the part of the user interface displays a picture of every SMART product. Press the look from the product using the settings you need to change.
Select Pen and Button Settings within the list.
Press Eraser Settings .
Select an eraser size.
Press OK in order to save your settings.
Press OK to shut the user interface.
©2008- 2011 SMART Technologies ULC. All legal rights reserved. Last updated April 25, 2011.
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Source: onlinehelp.smarttech.com