10 - Corrugated C-Flute Tile ATC Papers - Vertical Flute White. Mini fluted pleats makes these great for Artist Trading Cards, and thin enough to slide into an ATC card sleeve. Fluted on the front and flat on the back. Paper can easily be cut, painted, inked, distressed, you name it! Package comes with 10 perfectly cut 2 1/2 in. x 3 1/2 in. ATCs.