Two Part Answer!
(1) If you increase your pledge amount by $5 (but stay in the same reward tier) I will ship you 10 extra magnets in addition to the 46 original. PLEASE Do Not change reward tier, just increase pledge by $5 and I will be able to identify you for extra magnets.
(2) Several backers have correctly pointed out that the square design uses 46 magnets instead of the promised 45. Because of their diligence I will include 6 extra magnets instead of 5!