Kronos compatible bar code labels, pre-numbered in roll format. These numbers run in a non-repeating series. Bar code format is interleaved 2 of 5 (i 2 of 5) 18 digit. Red background prevents photocopying. NOTE: These labels are masked in a standard red color, wich works well in most scanning systems. For a lable with a slightly lighter colored red mask, please see our similar 000440LR-QTY500 product.