Avery Labels come in many sizes and colors. Each Avery label is named after its corresponding price gun. For example, an Avery PB 1 Price gun would use an Avery PB 1 Label. American Retail Supply offers fluorescent red, fluorescent green, white, yellow, removable, pre-printed and much more with Avery Labels. The Security slits are to prevent shoppers from removing your price labels. If they try and remove your labels, they will rip. Use the florescent red labels for on sale items and the white ones for regular sale prices. Removable adhesive back makes it easier to stick them on items or shelves. American Retail Supply can also customize an Avery Label. For more information please call 800-426-5708.