Livestock ear tag marker is used to record the desired information on the animal. The ink used in this magic is resistant to heat, moisture and other chemical factors such as detergents and disinfectants and does not fade in sunlight. The ink is designed to actually penetrate and bind with the plastic ear tag to provide the longest lasting marks possible In addition to the ink, the felt (magic tip) of the marker is also very important for ease of writing. The stronger the felt, the longer the life of the marker and the easier it is to write information.