I don't know if it's just the Avery software of what but these do not print the way that you see them on screen. It's incredibly frustrating when something is centered and there should be no problem with it printing centered on both the front and back but the cards end up overlapping and you can't print doubled sided because they just don't print right. I never have this type of problem when I print regular index cards or word/pdf documents so I'm going with its an Avery software glitch but as long as you print one-sided they're OK.
These are greeting cards for the budget conscious. There are two common formats for reusable cards. Firstly, there are cards with slits in them positioned to hold pages. Secondly, there are notepad style cards where pages stick to the back of the cards. The pages that have been used for reusable cards can be removed after being received and fresh pages can be used to reuse the cards.