The Mighty Marker IM-31 Arro-Tag uses specialty ink that chemically bonds into polyurethane tags and plastic surfaces. Unlike standard markers that sit on top and rub off with handling, this ink bites into the material to create permanent marks that resist abrasion, fading, and weather exposure. This marker works across livestock operations for marking cattle, goat, and sheep ear tags. Healthcare facilities use it for wheelchair tags and hospital equipment identification. Industrial operations rely on it for rental equipment tracking, asset management, and tool identification where permanent marking is critical. The dual tip design gives you three marking options in one tool. The 2.3mm bullet tip handles medium-width everyday marking. The 4.0mm chisel tip delivers fine detail work when you use the pointed edge, or broad coverage when you use the flat edge. Mark serial numbers, identification codes, names, or departments without switching tools. The valve action mechanism delivers controlled ink flow with a simple pump motion. No shaking, no drips, no dry starts mid-job. The 10ml reservoir marks hundreds of tags before replacement. Black ink provides maximum contrast on light-colored tags. Mighty Marker is USA manufactured, family owned and operated, with nearly 70 years of experience producing professional-grade marking tools for demanding applications.