The pen's barrel is made up of several powerful cylindrical magnets, which can be taken apart and snapped together in different ways, as this video shows.
There's no practical benefit to the Polar Pen. It's more of a conversation piece and time waster.
The problem, as far as health officials were concerned, was the prospect that children might pop one or more of those little magnets in their mouths.
"The results of swallowing small powerful magnets can be very serious and life-threatening," says the cease-and-desist letter Health Canada sent to Gardner, according to CBC News.
"Swallowing incidents have often resultedRead More »from Health Canada quashes Polar Pen because of magnet threat, entrepreneur out $100k