Dykem 44401 Permanent Marker, Yellow                  The DykemA(R) TUFF GUYa,,c is a heavy-duty, truly permanent ink marker which features a non-xylene based formula. This valve-action marker is ideal for permanent identification of parts or accessories. The clear, crisp marks resist fading even when subjected to varying, extreme climates. TUFF GUYa,,c won't rub off slick surfaces like plastics and shrink wrap.