12NS13NBK20- 12" Record Divider Cards - LESSER CUT SLIMLINE - 20mil - 6" x 13 1/2" - Black - (30 Pack) Reusable - Simply flip over or turn upside down! Easy to label with a permanent marker or affixing a label. 20mil Thick 6" x 13-1/2" - Great for Staggering in Your Bins or Laying Sideways on Your Shelves! They're durable, and feature rounded corners to prevent jabbing yourself!