This key chain comes from a series of cards that puts hard to memorize information at your fingertips. <br> <br> Same as a standard badge (or credit card size; 2 1/8" by 3 3/8"). Each card is about half the thickness of a credit card so it won't weigh you down. <br> <br> Please note badge cards are NOT removable. Black clip cannot be opened. <br> <br> Cards include (in this order): Lab Values, General Healthcare Conversions, Adult Vital Signs, Medication Math & Drip Titration, Weight Conversion General Range