This set of 2 English Flint Rocks by Vern's Flint and Steel is a must-have for any outdoor enthusiast. These rocks are perfect for backpacking, hunting, camping, and hiking. The black and grey color of these rocks makes them easy to spot in your gear, and they have been knapped in the United States for added durability. These rocks are suitable for use with Flint and Steel, and each rock has a length of between 2-1/4" to 2-3/4" and for me all the edges work for making sparks unlike others that people sell. With their primitive features and United Kingdom origin, these rocks are a reliable source of fire in any situation. Add this set to your outdoor survival gear, and stay prepared for any adventure.