Want an invitation that is out of the ordinary? Surprise your guests when they open these unique 6.25 inch square petal cards. Made from 80 pound cover weight Basis card stock, these "flower cards" come in a variety of pretty colors with professional score lines. Our DIY blank invitation petal cards have four rounded “petals” that lock together to create a secure origami-like fold. Each card can be mailed on its own by closing it with a seal or sticker.