Geocaching is a game of adventure, exploration, community and statistics! Some find the statistics section in their Geocaching.com profile to be interesting. Some see it as a challenge. If you are one of those who do not just find the 1.5/1.5 caches and cannot stop until all the zeros are gone, celebrate when you fill that grid! There are trackables, pins and patches to help you show your pride in the game, your accomplishments, and of course, statistics! The D/T Grid is based on the 81 possible combinations in geocaching for Difficulty and Terrain and can be checked in your player profile at Geocaching.com The D/T Grid Challenge Pin is approximately 1 inch in diameter and features a butterfly clutch back. Dimensions: Approximately 1 inch (2.54 cm) in diameter.