"It's heavier on the writing end," says Linya. "The consumer version also has a little marking on the casing to indicate the drawing side."

"So you're selling these," says Tien.

"Yes. Well, the first batch is more or less being given away as part of the initial advertisement. You can have one, if you'll use it in front of people and tell them if they ask where to place orders. But we're out of one of the colors, so it'll have to be black or silver or white."