Great composition aid for any photographer, plein air painter or sketch artist. Crystal clear acrylic construction makes it durable and waterproof. Helpful for beginner, intermediate & advanced photographers and artists. Small, convenient and easy to hold this is a great tool for any urban artist art kit. 2mm thickness makes it nearly unbreakable & conveniently fits in any wallet or camera bag. Fit in your wallet or Altoids can artist pallet kit (art EDC) ⭐ A small American owned and operated business. The Rule of Thirds is the most used composition guide for all photographers and artists alike; this "composition viewfinder" serves as a "cheat sheet" to help any photographers & artist find that composition in the environment. With the inclusion of a dot in the center of the very center of the card, this viewfinder was also designed to help you find the center of your image and quickly line up any composition. The framed area of the composition viewfinder is specifically designed with an aspect ratio of 3:2 which is the same aspect ratio of both full frame and APS-C cameras (Canon, Nikon, Sony etc). This means the card will help you compose your photographs perfectly. The grid is etched into crystal clear, 2mm, acrylic so they're completely waterproof and nearly unbreakable. They're also the size of a credit card making it easy to keep in any wallet, camera bag or art bin.