Blank Index Pocket Card Make Your Own Reference Plastic Waterproof Blank Plastic Index Card that accepts Permanent Marker & Ballpoint Pen Great for notes, reminders, protocols, new info, phone numbers, codes, the possibilities are endless! Writable on both sides & waterproof once dry - ballpoint pen even erases with an alcohol prep About half the thickness of a credit card so it wont weigh down your badge reel or feel bulky Durable waterproof card made of plastic 3" by 5"