Adhesive tape on the back allows for easy application on most flat-backed smartphones. It can hold one credit card/identification card/room key card/5 business cards or cash. It also includes finger slot to make phone holding easier. Please refer to the following imprint colors (PMS vs. VPS): PMS Black C refers to VPS 10034 Black, PMS 1235C refers to VPS 00006 Yellow, PMS Bright Red C refers to VPS 00030 Orange, PMS 485C refers to VPS 00011 Scarlet, PMS Rubin Red C refers to VPS 00009 Red, PMS 2415C refers to VPS 00031 Fuxia, PMS 2695C refers to VPS 00012 Violet, PMS 2945C refers to VPS 00008 Light Blue, PMS 274C refers to VPS 00033 Navy Blue, PMS Reflex Blue C refers to VPS 00004 Blue, PMS 335C refers to VPS 00010 Green.