No.3677
What the hell is this green board and why do so many manga artists- artists in general have it??? Whats so special about it??
No.3682
It's a cutting mat, they're good for cutting stuff on cause you can drag pointy things or a blade like a razor over em and the cut mark won't stick around and be too noticeable afterwards
http://www.amazon.com/ALVIN%C2%AE-Professional-Cutting-Mats-CUTTING-18x24/dp/B0025189VE